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Unable to flash the Uboot to Zyxel NSA325 (v1) (3 replies)

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Hello all,

A couple of days ago my ZyXEL NSA325 v1 died. Only the POWER and the HDD2 LEDs are lit and the box gets in the reboot loop - restarting every 30-40 sec.
So I read a couple of threads about using kwboot. I followed this and this topics. At first I was constantly getting a "bad message" error, but at some point (don't know how and why) the process makes it to the point of:

Sending boot message. Please reboot the target...\
Sending boot image...
0 % [......................................................................]
1 % [......................................................................]
................................................>
97 % [......................................................................]
99 % [....................................]
[Type Ctrl-\ + c to quit]

At this point the NSA325 is not at the reboot loop anymore, but now my issues is that nothing happens next?! I cannot write down nothing in the terminal, even the Ctrl+C is doing nothing. If I reboot the box (unplug the power cord and plug it back in) the box again runs into the reboot loop issue... I've repeatedly entered the same kwboot command over and over again and I'm always get stuck here. Please, advise me what I am doing wrong.

For serial connection I am using a USB to UART TTL CP2102 converter, and Ubuntu 22.04 laptop. I've tried with both "uboot.2017.07-tld-1.nsa325.mtd0.kwb" and "uboot.2023.04-tld-1.nsa325.kwb"

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