Fix (bootloader) This command is not implemented/supported
I had just gotten my hands on the Motorola G54 5G to try out a few under-the-hood tweaks. Right after unlocking the bootloader, I proceeded to root it via Magisk, but was greeted by two major roadblocks. The first came when I tried to temporarily boot the patched boot.img file via fastboot boot patched_boot.img command.
In theory, the device should boot to the OS, and I should have gotten a temporary root [after a Direct Install, this root would have changed to a permanent one]. But the end result was way off the radar- it straightaway greeted me with the “(bootloader) This command is not implemented” error message.
Since this was the first time I came across such an error message, it intrigued me even more to debug the root cause of this issue and its fix as well. And fortunately, I was able to find them both, which have been documented in this guide. So without further ado, let’s check them out.
The Reason for this Issue
The “(bootloader) This command is not implemented/supported” error is most likely to happen if you are using the fastboot boot command on a MediaTek device. But what does it have to do with a chipset? Well, MediaTek hasn’t fully implemented the Fastboot Mode on some of its devices [most of which are from Motorola], which in turn results in the aforementioned issue. Now that you’re aware of the reason, let’s address the elephant in the room- how to fix it.
Fix (bootloader) This command is not implemented/supported
To fix the “(bootloader) This command is not implemented” error, you’ll have to use the fastboot flash command instead of the fastboot boot. In our case, we had to directly flash the patched_boot.img file instead of doing a temporary boot, using the fastboot flash boot patched_boot.img command. But this isn’t the end of the story.
Remember, we talked about two roadblocks in the introductory paragraph? While we discussed the first one, there was no mention of the second one. Well, this is when it comes into the picture. When I tried flashing the patched boot, I was greeted with the Preflash Validation Failed error. Turned out, I had to flash the patched boot in the FastbootD Mode, as opposed to the usual Fastboot Mode.
Do note that this is only the case with some rare devices; most devices still follow the Fastboot Mode. But how to identify if your device follows which mode? Well, start by flashing in the Fastboot Mode and if you come across the Preflash issue, then flash in the FastbootD Mode.
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