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USG60 NO SUCCESFUL REBOOT, BOOTLOADER CORRUPTED?

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Hi all! Two weeks ago happened something really strange! I choose to reboot my USG60, no worry about rebooting by PUTTY or directly from GUI, it initiate reboot then the led blinks green till succesful boot...ehm no, all lan ports where OFF, no leds blinking, nothing! No connection! I do a 3 time forced hardware reset and finally the device booted succesfully. Then I manually updated all firmware partitions with same firmware. All seem to work well. Loaded the last good config file and all is ok and back to working config. Recently Zyxel provided a new firmware 4.32, gone to the GUI and choose the option to update by cloud download firmware...downloaded it and I choose to reboot the device automatically after installation. Device rebooted but green led blinks forever, no boot?! Then after 45 minutes the only way was to power off manually with the hardware button, no way to reset in any other way! Device rebooted and in the GUI I read on the dashboard BOOT OK. Then, worried about the possible firmware corruption after forced power off, i loaded the new fw on the standby partion without auto reboot then I rebooted manually choosing that partition to become running, it worked! After that I redownloaded the new firmware overwriting the first used partition, could be corrupted no? and rebooted the device manually to that running partition and worked. Set the config with the same config file that always worked and all is ok. Many files of backup the device created and visible in the file manager. Checked if the config is correct then tried to reboot the device. NO GO! led blinks green forever!!! Any idea? Device works perfectly anyway. Could be the bootloader corrupted for some reason that inhibit correct reboot but sometimes reboot works? I thought it was a problem with the config file but if I reset the device and load the firmware to a partition and choose to automatically reboot after installation, device never boots up correctly...

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