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[GH-ISSUE #468] M3 4.2" tag unable to flash correctly / question about flashing) #290
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Reference: starred/OpenEPaperLink#290
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Originally created by @sorphin on GitHub (May 23, 2025).
Original GitHub issue: https://github.com/OpenEPaperLink/OpenEPaperLink/issues/468
I have gotten a box of 2023 dated M3 Newton 4.2" tags. (BWR) (nrf82511 based)
(Revised from what I originally wrote due to getting the OEPL flasher to work)
2023 dated M3 Newton 4.2" tags, able to flash/see them with atc1441's ESP32_nRF52_SWD and (after figuring out the right pinoout) was able to flash them with the OEPL-Flasher.py flasher. Have to erase first with the ESP32_nRF52_SWD due to SOC lock. OEPL won't flash until erased/unlocked. Flashes. Have the expected single green flash, but nothing else. Referenced information in #273 for ideas. SOC was locked, so did an erase and used the varuicrdump-4.2-ssd-experimental.zip referenced in #273 and used the patcher to patch it with my mac address. Screen never changes. Not sure what's missing now...
09E32BEEB699_uicr.bin.log is the UICR I uploaded and I used SOL_M3_Uni_full_0029.bin. (Possibly changed EPDs again?)
thanks.
-sorphin
@sorphin commented on GitHub (May 24, 2025):
managed to carefully get one of the tags open some small cracks on the plastic, but no damage to the screen thankfully. I've attached the pictures I took showing the board version, other shown components that I'm sure everyone is familiar with, and specifically the labeling on the cable for the eink display in case it's helpful.
@sorphin commented on GitHub (Jun 15, 2025):
Issue was apparently with the syntax of the OEPL-Flasher.py command. Possibly should have a clear note to NOT use --flash if only writing the infopage (I could swear I've seen example with --flash and -i...)