Uploading from mind plus to microbit
PatLeonard 2026-09-23 04:04:52 150 Views2 Replies when uploading from mind Plus to microbit on windows it pauses at 98% for a long time,is there a fix for this
2026-09-23 18:38:00 
stephen.hanks
I had a similar 98% upload issue before, and changing the USB cable and avoiding a hub fixed it for me. You could also try the WebUSB upload method if Mind+ supports it.
stephen.hanks 2026-09-23 08:56:12 Jason.Miao
hi,
That 98% stall is the last flash-write stage - the data's already transferred, the board is erasing/writing flash at that point. If the connection or driver hiccups there, it hangs.
A few things that help:
Swap the cable for a proper data cable (not charge-only) and plug straight into the PC, not a hubMind+ is known to hit a Windows bug here - after the Feb 2023 Windows update, transferring to the micro:bit via file-copy can fail/timeout. The official micro:bit fix for that is WebUSB direct flashing, so try the WebUSB upload path in Mind+ if it has oneCheck Device Manager for a leftover "mbed Serial" driver and uninstall it - it breaks flashing on newer Windows buildsWorst case, reflash the micro:bit's interface firmware: hold the reset button on the back, plug in USB, drag the DAPLink hex onto the driveOfficial error 504 is exactly this - "the transfer of the hex file to the micro:bit has timed out", see https://support.microbit.org/support/solutions/articles/19000016969-micro-bit-error-codes
Jason.Miao 