I want to install OpenWrt on my O2 6431 box and do a backup of the original stock firmware to be able to revert my decision. As far as I understood so far, this is only possible via a serial connection which needs opening the box and possibly soldering cables.
- Is this true?
I could live with the option of an updated boot manager, that cannot be reverted. On the brnboot screen I can choose, if I want to install "Firmware" or the "Boot Manager".
2. Is it possible to install u-boot only via option "Boot Manager" and
2.1. do a backup with the help of u-boot?
When I install OpenWrt via the option "Firmware"
3. will this overwrite the stock firmware or will it append "the files"
3.1. is it possible to have original stock firmware and OpenWrt in parallel?
Thank you in advance, Stephan