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Thanks for the quick response Paul, Too bad about the GD32E230F8. Is it possible to get a Teensy 4.1 with MKL02 bootloader IC from PJRC at this point? Or has the PCB footprint been permanently updated to new rev?

I've been working on replacing U1 for industrial MIMXRT1062CVJ5B MCU on a T4.1 board. After replacing U1 I am getting error code (10 blink) serial number - very much expected with old bootloader chip. The boards I have are post June 2022 with "U2 replaced by GD32E230F8". I see MKL02 with...