Imperial DABMAN i250 Rev.2 repair

Repair of radio Imperial DABMAN i250 REV2.
Symptoms: When you turn on you see the logo, then the upgrade warning and go to select network connection. No matter what type of connection you choose, it will be infinitely unsuccessful. There is no way to enter the main menu.
Diagnostics: connection via UART to NUVOTON SoC N32905U3DN
Cause: failed firmware upgrade procedure
Method of repair: firmware flashing in SPI flash (25Q32).
Imperial DABMAN i250 REV.2 6TTNNA16 (200817) credits to Jan
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Firmwares for:
Imperial DABMAN i150 tn9thk3b
Imperial DABMAN i200 tn9shk61
Imperial DABMAN i450 tn9shm6k
Imperial DABMAN i600 tn9shf6m
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Imperial DABMAN i200CD TN9SHC6A credits to ​ @proditaki
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Imperial DABMAN i250 no REV TN9THF7C 180105 credits to ​ @proditaki
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If you flash REV2 firmware version to a normal (without any additional marks) i250 - the device will run (most functions will work: LAN, WiFi, iradio, Bluetooth), but the digital (DAB) and normal (FM) receiver will not work (probably a different receiver hardware)
Imperial DABMAN i250 REV.2 6TTNNA16 200817
Imperial DABMAN i250 REV.2 6TTTNA16 221107 credits to ​ @proditaki
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Components:
NUVOTON N32905U3DN SoC
25Q32 SPI Flash
TDA7297SA 10W+10W DUAL BRIDGE AMPLIFIER
CSC2314F 4-Channel Input Audio Processor
GL850G USB 2.0 HUB Controller usb1 wlan; usb2 flashdrive; usb3 lan; usb4 empty
AX88772CLF USB 2.0 to 10/100M Fast Ethernet Controller with Microsoft AOACSupport
93BC66 3 - wire Serial EEPROMs 1K/2K/4K
BLUETOOTH1: IS1621S
BLUETOOTH2: BK8000L