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When trying to apply a Firmware update via the GUI I seem to be greeted an 'Incorrect checksum' msg.

This happens with RUT9_R_00.07.00.2_WEBUI.bin and RUT9_R_00.07.01.1_WEBUI.bin although RUT9XX_R_00.06.08.5_WEBUI.bin was applied successfully. However even after applying this I was unable to ssh in or login via a browser.

Something ain't right!
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Just to add, after a reboot, I couldn't even ping 192.168.1.1.

The system is well and truly fscked.

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Hello, 


For this issue of yours, kindly try to recover the device by upgrading the firmware via the bootloader menu. 

You can recover it by following: RUT9xx Firmware via The Bootloader Menu - Teltonika Networks Wiki (teltonika-networks.com)

Upload RUT9XX_R_00.06.08.5_WEBUI.bin first and see if the device will work fine. After doing so Upgrade to 7.01.1 firmware without keeping the settings. 

I hope this helps


Regards,
Mellow