Spdif

@Peter The cover is open actually. I still have to access via serial connection on board pins and ftp connection via LAN. I can load firmware again again. But everytime result is same. Looks like the wrong fw was installed. But it is not like that.

@Peter2, unfortunately, actually I don't have webgui. Completely lost it. First of all, I thought of updating from webgui, but this option was not available in ISP fw. @tonygibbs16 PMG3617GA method is a bit complicated to me. I will try to understand in a quiet time. Thank you.

Hi @Peter , unfortunately existing status ftp connection is imposible. Hi @tonygibbs16 , I understood this method but I think the bootbase file (304tuj.bm) referred in this page for old model zyxel router. Can it be completely damage the router?

I'm not sure if I'm actually uploading via ftp connection. I transferred the firmware with the Put command in the Pumpkin tool. I will also try to install it using the method in the first link. But I don't think I can establish an ftp connection. FTP is already disabled on ISP devices

Yes, before I tried it on a VMG3625-T50B and it worked well. The modem had become a retail version. Same method doesn't worked on this router. First command is ATDC on terrraterm Second command is ATUR firmware.bin (firmware.bin is firmware name) After the second command, the device waits for the firmware to be downloaded…

I have an ISP version EX3301-T0 . I opened the cover and connected via serial connection and ethernet cable. Thanks to terraterm and pumpkin tools, reflashed the router with the latest fw. But now the router rebooting contuniously. Probably the firmware (5.50ABVY.4C0) doesn't match with my router. Logs: Machine restart ...…