rdbl omitted the ISO15693 OPTION flag (0x40) so the tag returned [flags][data] without the lock byte the parser assumes (shifting data one byte) and included the 2-byte CRC in block_data. wrbl reused the read flags (no LONG_WAIT) so the firmware used the short RX timeout and the ~20ms write ack arrived too late -> false failure.
rdbl: set OPTION (0x62/0x42), strip CRC (data[2:-2]). wrbl: CONNECT|READ_RESPONSE|LONG_WAIT (0x61). Mirrors C client CmdHF15Readblock / hf_15_write_blk. Pre-existing, independent of the rebase.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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