Every attempt to flash any firmware ends with an error: UPDATE FAILED
Something went wrong during updateProbably you have chosen wrong file. Please, try again or contact with the author of this modification. You can also get more information during update in U-Boot console. Would it be possible for you to provide a partition repair script?
Have you tried updating via uboot?
Yes, I've tried this method. I checked several firmware versions both official GL.iNet ones and clean vanilla with no change. Still getting the same message
Im afraid in this case you need to obtain the emmc partition file from GL-iNet they can help you more with this 
Hi
We have sent it via private message, please check.
Thanks a lot, it works!! The instructions are a bit confusing,though. After three attempts and some trial and errors I finally got it working.
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