I have recently successfully updated the bootloader on an Arch Mix board using the instructions in your Wiki here:
Using NXPBooTUtility to Flash Arduino Bootloader
However, there are two bits of information missing which should be added to the Wiki article:
At the instruction:
- Connect Arch Mix’s Rx Pin to 3.3V Pin using a Female Jumper wire and adjust the Switches to 0001
the pin should be the RXD Pin, or pin 19. There are several pins called RX on the pinout image.
Also, in the NXP Boot Utility it’s necessary to set the MCU Device to i.MXRT105x - LFBGA196, as it was initially set to something different.