Firmware information
  CD−R CD−RW DVD−R DVD−RW DVD+R DVD+RW
Strategies 1.16 1.14 1.40f 1.30f 1.38h 1.26f
Bitsetting   Yes Yes
Date1 (*) 2004-11-01
Date2 (*) 2004-11-01

(*) Date 1 seems to be related to the strategy version while date 2 seems to be related to the main firmware code

The following firmwares are included:

This is the original HP420 stock 1.33 firmware. It is one of the last firmwares to support the old Ricoh commandset for booktype settings which allows changing the booktype on already burned DVD+RW.