Back when it was 12/23/2019 a snapshot build of this router would work but the stable release (18.06.04) wouldn't. The snapshot around 10/10/2019 also worked as well (OpenWrt SNAPSHOT r11189-33dd522f24).
Today I was trying to upgrade and I learned that the current snapshots build don't work at all for me. It used to be that the snapshot version worked but the stable version doesn't. It is like this guy's thread OpenWrt Stable not booting for ZBT WE3526
However as of 4/26/2020 the snapshot build doesn't work anymore.
I've tried 18.06.8 stable, 19.07.1 and 19.07.2 for ramips-mt7621-zbtlink_zbt-we3526-squashfs-sysupgrade.bin today and they didn't work. To unbrick, I would have to flash one of the snapshots I saved such as OpenWrt SNAPSHOT r11189-33dd522f24 but with these old snapshots I can't do an opkg update...
What can I do?
Is it because ZBT recently changed the amount of ram for the WE3526? I have the 256MB version. Which is slightly different from https://openwrt.org/toh/hwdata/zbt/zbt_we3526
Any help is appreciated. Currently I'm trying to build the image myself from the stable branch following https://openwrt.org/docs/guide-developer/quickstart-build-images but I'm not sure if this will solve my problem. Some guidance to customize the build for 256MB ram is appreciated as well.
Edit 1: Maybe if I edit the reg = line in /openwrt/target/linux/ramips/dts/ZBT-WE3526.dts like shown in this commit things may work. I will update after testing a compiled image.