I had that problem (unable to update due to non boot)i forced write in service mode, but when i did so i noticed that version was something like 3.000** i know latest is platform:2.000500 hdd app: 2.140000! now when i reset the unit it says:"THERE IS NO APPLICABLE PROGRAM" , the unit is a Z2 sept 07. i went to service mode and it says: PLATFORM [2.000500] RECOVERY [2.000000] BOOTLORDER [2.000000] CPU CORE[00000004] APL PROGRAM[uNKNOW] GPS PROGRAM[1.200000]. now notice that apl program is unknow, my question is does anybody know how can i get the apl? is in the pioneer test disk?