GoColor7 bricked

Hi — I just joined this forum. I have a GoColor7 that I rooted a while back. Today I tried to check for new firmware, so I uninstalled Magisk and flashed what I thought was the original boot.img. I must have used the wrong file, because now it won’t boot.

I can enter recovery mode and have tried flashing update.upx files linked here in the forum, but the GoColor7 refuses to install versions with timestamps older than the one currently on the device. I also can’t flash the Magisk-patched boot because it won’t install, and I can’t switch from slot b to slot a.

The reader’s current version is: Onyx/GoColor7/GoColor7 11-2025-06-19_00-19_4.0.2-rel_0614_35a32af51/7718. Does anyone have a link to a newer update.upx file?