Radtel RT-900 Fix Bricked
Added 2025-04-05 17:43:11 +0000 UTCIf you get a bad flash on an RT-900 it may appear to be bricked as you cannot get back to the update mode (switch on with two buttons under PTT pressed).
It is not bricked. The problem is the radio does not have a hard power off. The switch on the volume control is a software switch, so if there's no valid firmware running to power the device down you can no longer turn it off, and thus cannot turn it back on to get into flash mode.
The fix is pretty simple. There may be other ways to do this, but the method I've been using is to remove the battery. Make sure the volume control is turned off, then reconnect the battery. You can now turn on with the two buttons held to enter flash mode again.
Comments
You can't, you have to flash the backup firmware first, the original firmware has no ability to dump the entire spi memory. The post you want is this one: https://www.patreon.com/posts/126720930
Marcus Dudley
2025-06-17 15:35:18 +0000 UTCSorry... I'm late to the party! Just subscribed Yesterday and I have a good FTDI cable, can read with the original CPS. As per NICSURE FW I have 2 Tidradio H3 working properly on the last release. Can somebody explain how to save original SPI, BEFORE flashing NICSURE FW?
Vn800art
2025-06-17 15:31:34 +0000 UTCI left the battery out overnight and it worked
Les
2025-04-05 19:04:31 +0000 UTCNow you explained it.... it is so simple 👍
ErikS-web
2025-04-05 18:51:42 +0000 UTC
