Table of Contents

Firmware Versions


Firmware v7.21.2008 was first distributed with the HP SDK, and is not currently known to be provided on any unmodified HP-20b.

HP software v7.21 (v7.21.2008) – 21-Jul-2008:

File: HP20b original ROM.bin (in SDK)
MD5 checksum: 07fa8a65815ee2cb52aa284152d51c5d
cksum: 3999079144 131072
Self test checksum: 126.126


Firmware v6.24.2008 seems to be the most current version floating around unmodified HP-20b's in the field.

HP software v6.242 (v6.24.2008) - 24-Jun-2008:

File: flash.bin
MD5 checksum: 7387a2cabec7dc53ca4224537d52327c
cksum: 857666795 131072
Self test checksum: 213.213

Amtel Boot ROM

File: rom.bin
MD5 checksum: 08e1b75924aca69ee0be33ee482ffcf9
cksum: 4280875116 12288
Self test checksum: Not applicable

Method of verifications

Images were downloaded three times (JTAG clock rate of 380kHz, 100kHz, and 58kHz). All three images were bit-for-bit identical. MD5 checksum and cksum values were for the entire 128kB flash (or 12kB ROM, in the case of rom.bin).

(Someone else please verify that the dumps are correct…)

See Also