Yeah...UP and RUNNING...
Noticed today that I could build a custom firmware on the OpenWRT Firmware Selector...
Used the same build list to build a custom firmware for my FLINT 1 the same as my FLINT 2.
Success...Downloaded factory.bin, factory.ubi and systupgrade.bin.
At first tried loading the factory.ubi through the Flint 1's UBOOT...I was using my Brave Browser and it was not processing the request. I switched to Firefox Browser...I was then able to upload the factory.ubi via UBOOT (It took quite a few minutes)...Success...I now had OpenWRT r29091 running on my FLINT 1...Next I restored my saved config from my FLINT 2 as my custom build had the SAME packages for my FLINT 1 as it did on my FLINT 2...After reboot everything looked good...I swapped the FLINT 1 in place of the FLINT 2 putting the FLINT 1 online...
Upon boot everything looked OK but I did not have internet...The WAN port was not started. Eventually I figured out that the WAN port had eth1 configured and not WAN in the WAN settings...Once I set it to WAN and restarted it it connected and I had internet and my VPN also automatially started and is working correctly...Everything looks good...So nice to have FLINT 1 now on the same OpenWRT setup as my FLINT 2...Will leave it online today for testing...
Turned out that yesterday's problems were all due to the files that were being offered. Today's files that I did a custom build solved everything. Oh...And the GL.inet UBOOT is intact so that means switching back and forth between GL.inet Firmware and OpenWRT firmware remains easy.
EDIT: I did have to ssh into the router and correct /etc/config/wireless file as it had two entries for the radios in my Flint2 (Since I restored the config from the Flint2)...Simply removed those two entries radio0 and radio1...Then renamed the valid radio entries to radio0 and radio1 correcting names within the sections as well. Now 2.4 and 5Ghz radios are correct in the Flint 1 config and working great (tested). Backed up new config. Everything working.