RT-900 Flash Backup
Added 2025-04-15 15:58:23 +0000 UTCIn preparation for the eventual release of the RT-900 firmware, I would really advise everyone backs up their SPI flash memory.
Unlike the 890 where tools for doing this were already available, no such tools for the 900 exist, So I knocked something together.
This is a Windows application and an RT-900 firmware image. The firmware is just an SPI flash and UART wrapper, it does nothing else, it is meant to be flashed simply to allow the SPI Flash memory to be read from the radio and saved. The application is also able to flash firmware bin files as well.
To use:
Open "RT-900-BinFlasher.exe"
Click "Browse"
Select "flashdumpFW.BTU"
Connect Radio to PC via a GOOD (FTDI or CH340) programming cable. The app/radio communication is at 345,600 Baud so it needs a good quality chipset.
Select correct COM Port in the application.
Turn on radio while holding the bottom two side buttons, screen should say "Update".
Click "Flash"
Once the firmware is written, the radio will reboot with a blank screen, the green LED will be flashing
Click "Read SPI" in the Application
Select the backup file name to save
Wait for the read to complete
You now have a full backup of the SPI Flash memory, you can go ahead and flash the stock firmware back to the radio.
Note that the application cannot yet write the SPI Image back to the radio, the "Write SPI" button does nothing currently.
Comments
The full FW version and programmer is supposed be able to do that, but as you noted there's a problem with the file size check.
Marcus Dudley
2025-07-02 22:09:15 +0000 UTC@nicsure - Marcus, did you ever progress to the point of allowing the SPI backup to be written back to the radio in the event of SPI corruption etc?
Kelvin Hill
2025-07-02 20:33:18 +0000 UTCEverything worked great on this end running the "LowSpeed.BTU". Win 10pro 'UM300' Nucbox PC (Ryzen 5 3550H)
R.D.M.
2025-04-15 23:05:11 +0000 UTCThanks for all your work on this. Worked for me. I initially had a hiccup, but went smoothly after a cable change.
Brandon Kushner
2025-04-15 21:09:48 +0000 UTCEverything worked. Back to stock FW with no problems...
Alan Rodin
2025-04-15 20:35:56 +0000 UTCNo it's just the flash backup image of my radio prior to updating it to 1.09.
Marcus Dudley
2025-04-15 20:18:34 +0000 UTCAlan Rodin
2025-04-15 19:53:50 +0000 UTCThat new slow speed version v1.04 working for me. Thanks Marcus.
Alan Rodin
2025-04-15 19:52:20 +0000 UTCTry the 1.04 version with the slower speed firmware. You should really get a couple of CH340 cables, they really are the best.
Marcus Dudley
2025-04-15 19:34:45 +0000 UTCAlan Rodin
2025-04-15 19:28:58 +0000 UTCRuns great Windows 11 x64, version 24H2 (26100.3476)
Matt P
2025-04-15 19:24:56 +0000 UTCWorks fine on Fedora 41 Linux host, Virtualbox 7.1, Windows 11 Pro guest.
Kelvin Hill
2025-04-15 17:16:37 +0000 UTCRuns good on my Dell windows 11 pro x64
Stacy Poteet
2025-04-15 16:07:33 +0000 UTCRuns fine on Windows 11 x64 and Windows 7 x64
Bulba Bulbacz
2025-04-15 16:04:04 +0000 UTCOOOOOH 🎵 This one runs locally on my machine, without needing a sandbox :D
Shay C@
2025-04-15 16:00:28 +0000 UTC
