T42G stuck in Recovery Mode

Hello all,

Recently, I tried to upgrade an T42G phone to 29.73.0.45.

However, the upgrade failed and the phone get stuck on the Welcome screen.

So, I tried the recovery mode. The phone could get the files from the T4X_SPI.bin, the T4X_SPI.rfs and the T42.rom from our local TFTP server.

But right now, it is frozen on Firmware updating for almost an hour.

Could you please give us some troubleshooting on this?

Thank you,
Sebastian