GNC 255A Flash drive requirements

Discussion in 'Avionics and Upgrades' started by Jdm, Apr 23, 2020.

  1. Jdm

    Jdm Pre-takeoff checklist

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    Garmin says the 255 should be updated with a 8GB or smaller flash drive??? The cs guy said 16GB works occasionally, but it’s designed to use 8 or less. The Pilot’s Guide mentions nothing about the GB size. I can’t even find 8GB anymore. 16GB is pretty much the bottom. Anyone using larger flash drives? This all sounds very strange being it’s a brand new unit.
     
  2. WannFly

    WannFly Final Approach

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    Other users should chime in shortly, but USB 2 and 8 GB drives are plentiful. one example here.
     
  3. Jdm

    Jdm Pre-takeoff checklist

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    Thanks! I didn’t come up with anything locally.
     
  4. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    I just went through this with my GTR 225 (GNC 255 minus the nav). I had a larger flash drive (32 or 64 GB) and erased the existing partition and created a 256mb fat32 partition and it worked like a champ. I tried all sorts of different configurations before I found a solution that worked. I have windows. Can't help ya if you're iOS. (If you have windows, press the start key and start typing disk and the top suggested program is something like "create disk partitions" (I'm on android at the moment or I'd run through it). Word of caution- If you need to go through this process, make sure you delete the right partition! Don't come whining that you wiped out your C: drive and had to reinstall windows and you lost all your photos of nana. :rolleyes:

    Between my GNX 375, my G5 HSI, and my GTR 225, they all take a different flavor of memory. Respectively, SD, Micro SD, and USB Thumb drive adapter to whatever flavor the GTR has. (It's not mini USB. It's not micro USB. Thankfully, Garmin provided an adapter. God help me if that thing ever goes missing.) T'would be nice if it was all just one flavor. I digress...
     
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  5. Jdm

    Jdm Pre-takeoff checklist

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    I have G5’s. Didn’t realize they require any updating?
    Also have 650xi, and GI275. Wish it were an easier way to update everything. I don’t have the FS510 because it won’t work with the GNC255A.
    The GI275 will update with USB, but again, the manual doesn’t give flash drive requirements. Garmin CS says the G275 is designed to use 32GB flash drives or lower.
     
  6. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    I just bought my G5 HSI last month. It had with software 6.0 IIRC. When I started my install, version 6.4 was out, so I hooked up the backup battery and popped in a micro SD card with the newest software on it. By the time my install was finished, 6.6 was current and I had to go through it all again.

    It's super easy to do. (Once you get the micro SD card formatted right - fat32).

    Below are feature upgrades with the G5 software revisions. Garmin doesn't keep the revision list entirely up to date
    https://www8.garmin.com/support/download_details.jsp?id=10361

    Version 6.4 https://www8.garmin.com/support/collection.jsp?product=K10-00280-00

    Scratching my head where I downloaded 6.6 from :confused: I've searched all over. Maybe someone else can chime in on that. Garmin seems like it's losing interest in their G5 now that the GI275 is out :rolleyes:
     
  7. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    From another thread

     
  8. asicer

    asicer Final Approach

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    Does the GNX375 require a specific SD card? Or will any SD card within a certain size range work?
     
  9. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    I use the one that came with my unit (or supplied by the dealer).

    When my 172 was in the shop getting its GNX 375, I bought a 32gb SD card from Amazon. This was before I knew one came with the unit. The Garmin card is with my plane, so I can't check out what kind it is, but I've used the PNY card with no problems.

    I'm glad I don't have the 450/530 data card schemes that require a separate adapter (well, arguably my GTR 225 falls in that category).

    Here's the link for the card I bought in December

    PNY 32GB Performance Class 4 SD Flash Card (P-SDHC32G4H-GE) https://www.amazon.com/dp/B0019K261G/ref=cm_sw_r_other_apa_i_cJWOEb6Y6RZT4
     
  10. WannFly

    WannFly Final Approach

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    FYI there is a long debate on this forum on whether pilot is allowed to update G5 software on a certificated aircraft or not. not trying to start another debate, just saying, i do my updates at my avionics shop with a log book entry. Your G5 and your aircraft... so your call
     
  11. WannFly

    WannFly Final Approach

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    I think they pulled 6.6. i cant find it anymore. might be some bugs are being addressed and will re-release
     
  12. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    Interesting. I'll search out the thread.

    I admit (that I am currently) on the opposite end of the spectrum from you (and quite surprised it wouldn't be something an owner can do), but I've been wrong more often than right in a lot of ways and I may have just discovered a new one :confused:
     
  13. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    Should I (could one?) downgrade to 6.4? Yikes.
     
  14. WannFly

    WannFly Final Approach

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    not sure. technically you are flashing the chip of G5, but it also sends flash updates to other connected stuff like GMC 507 , GSA 28 , GAD 29 - you may not have any of them or may have GAD 29. will a "downgrade" flash those chips as well? technically yes, but depends on how garmin has defined the upgrade logic

    paging @bnt83

    Edit : comparing version of connected devices, looks like only the servo version changed from 6.4 .. so if you dont have the servos, you may be alright. but again i dont know how the downgrade will actually work
     
  15. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    I'll likely have to wait it out. If I put in a micro SD card with 6.4 on there, it'll look at its 6.6 and pull a PC load letter on me.
     
  16. asicer

    asicer Final Approach

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    Thanks. I checked and the SD card from Garmin is 8GB FAT32 with a volume label of "GARMIN".

    The reason I asked is because I was wondering if one could just keep a card in the plane and a card at home and swap them as databases become updated. Sounds like that's the case. It would be much easier than going to the plane, fetching the SD, bringing it home, downloading the update, going back to the plane, etc every 28 days.
     
  17. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    That's what I do, but I understand you can remove the card after the database is uploaded. Databases are stored internally.

    That way you can take the card with you... (Optionally, you can leave it in for data logging.)
     
  18. bnt83

    bnt83 Final Approach

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    I’m pretty sure you can downgrade G5 though I’ve never tried it.
     
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  19. Jdm

    Jdm Pre-takeoff checklist

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    I successfully got everything updated today. Used the GI 275 dongle/USB with a 16gb flash drive 2.0.
    The Pilot Guide was incorrect. Unable to follow the steps because of inaccurate information In the book. Garmin CS was actually very helpful. Said they’d had a lot of complaints. The guy had to look at one himself, and solicit help, but he got to the bottom of it alright.
    The 650Xi SD card update was no problem. It went exactly per the Guide step for step.
    The GNC255A was ok but the Guide could have been so much better. I ended up using a 2.0 flash drive with 4gb. It loaded fine once I figured out the process.
     
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  20. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    Excellent news! Thanks for keeping us updated.
     
  21. 5QK

    5QK Pre-takeoff checklist

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    Does anyone know where to get the usb adapter for the GTR 225?
     
  22. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    It looks proprietary, sadly. I have no idea why Garmin didn't just go with a Micro USB or other standard connector. Best best is to call Garmin and order it from them.
     
  23. Ryan Klems

    Ryan Klems Pre-takeoff checklist

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    Isn't their dongle just a Micro-USB male to USB-A female? I don't have one in front of me at the moment to confirm that, but that's what I recall.
     
  24. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    20200618_17205243.jpg

    Garmin on the Left. Micro USB on the right. Looks close, but not quite the same.

    I'm going up with my CFII tomorrow morning. I'll *gingerly* try attaching a Micro-USB and I'll report the results.

    FWIW - the PN on my Garmin cable is 320-00726-00. Text below that says Rev C and below that says 190520 :dunno:
     
  25. Ryan Klems

    Ryan Klems Pre-takeoff checklist

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    Heh, wow, I guess I never looked close enough! I love Garmin, but man, decisions like that are just a really shake your head kinda thing.
     
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  26. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    *IF* Garmin want's anything more that $20 for their dongle, let me test whether mine will read a database from a USB flash drive using a micro-USB adapter and I'll post the results.

    If successful, this item may do the trick for you, but again, I'll test it out tomorrow morning. https://www.amazon.com/dp/B00N9S9Z0G/ref=cm_sw_em_r_mt_dp_U_c296EbDWP3J8H

    Edit - Crap! I only have a micro-USB to male USB-A. (need female USB-A). Welp, I won't be able to test out if I can read from a flash drive, but I can at least see if it fits :fcross: You'd be on your own for the rest. Dimensionally, I've been able to confirm with a micrometer that it has the same height and width.
    :rollercoaster:
     
  27. 5QK

    5QK Pre-takeoff checklist

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    Well wtf did big g do this for. Stupid engineers
     
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  28. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    Maybe so they can sell us a $5 dongle for $100? :rolleyes2:
     
  29. MooneyDriver78

    MooneyDriver78 En-Route

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    FWIW, they both have 5 pins, the G is marked with an A, my generic cable is marked with a B.
    I believe the A is an older standard.

    Found these male USB-A to female UCB-C adapters:
    [​IMG]


    Tom
     
    Last edited: Jun 18, 2020
  30. 5QK

    5QK Pre-takeoff checklist

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    That looks like it might work
     
  31. jrcox19

    jrcox19 Pre-takeoff checklist

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    Pretty sure the GNC 255 has a Micro AB connector. So both a Micro A and Micro B cable will fit

    upload_2020-6-19_9-58-23.png
     
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  32. Ryan Klems

    Ryan Klems Pre-takeoff checklist

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    I hadn’t realized there were two variants of the micro usb plug! Can check off my “learn something new” for today :)
     
  33. Skip Miller

    Skip Miller Final Approach

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    It is no secret... a senior executive from Apple is now a marketing consultant for Garmin. The same guy who brought you this:

    iMask options.jpg

    (for all you Apple Fanboys, yes I am kidding!)

    -Skip
     
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  34. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    20200619_114455.jpg
    "B" fits my GTR 225. Can't confirm if the Pin Out is the same between A and B.

    I tried searching "microusb A to female USB A" and not much luck at first glance not returning results for B. Maybe the single letters are ignored by Amazons search.
     
  35. chemgeek

    chemgeek Pattern Altitude

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    Version 6.7 for the G5 is out as of May 12.
     
  36. Nathan Miller

    Nathan Miller Pre-takeoff checklist

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    Sweet! Looks like the rectangular receptacle (rather than trapezoidal-ish receptacle of B) is universal for A and B, hence "Micro AB" by the name of the receptacle.
     
  37. 5QK

    5QK Pre-takeoff checklist

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    Thanks everyone.