There are still reports of GL-MT2500 being bricked, e.g.:
The original post says (without a date for when the note was added):
Is the consensus that there currently is not a safe Uboot update for the MT2500? And is there an ongoing effort to sort those issues out?
OK, my MT2500 Brume 2 was not Bricked. It did take the UBOOT just fine apparently, but since I was not on firmware version 4.7 before applying the UBOOT file, it seemed to be. I had to use pre-boot again to also upload the 4.7.bin firmware file which updated successfully, and after that reboot, it was factory fresh. So, I restored the configuration from my backup, and everything is back to where it was before I started.
I'm going to answer at least for me. I have a Brume 2, running the latest firmware, 4.7.4.
I went ahead with the Boot upgrade process, using Chrome, on a Mac. Everything went smoothly, and I'm back up and running without a hiccup.
Is it possible to update MT2500 on 4.6.8 to 4.7 without updating the bootloader? Not clear yet...
Upgrading bootloader in first units looks like a lottery, and the risk of malfunctioning in still to be seen... But I would like to upgrade to latest firmwares.
@bruce : Is GL.iNet working on a bootloader that does not brick our MT2500s when upgrading? Should we expect a solution coming? It has been quite a lot of time since reports of high chances of bricking were published, but we do not have a clear solution yet... It is a bit disappointing...
Glinet have already stated that if the devices brick that you can get a replacement. Follow the steps carefully and use Microsoft edge browser / chrome with zero plugins enabled and you should be okay.
You would be best to upgrade the bootloader as that's where the problem lies.
The bootooader takes a few seconds to update. I actually updated the bootloader twice by mistake with zero issues.
I upgraded the bootloader before flashing 4.7 firmware. Im not sure if the firmware has any bearing on the bootloader but ideally you want to be running the latest bootloader and latest firmware anyway, if the device can't do that then would you want it??
Tldr. Just upgrade both via edge or chrome with zero plugins enabled (adblockers)