“Chronoswitch” Downgrader 5.0.f Advanced 09g Support! This multi-firmware downgrader allows you to install a lower (or higher) firmware without any fuss. No complex flash0 sharing, just running the firmware update.
However, there comes restriction with PSP models and compatible firmware. For example, a PSPgo cannot run 1.50 as there are no drivers for the system and the IPL format is incompatible. Much like this, the PSP 3000 09g is unable to install firmwares < 6.30 which removes it’s ability to appreciate the flexibility of permanent custom firmware. "Frostegater's" Downgrader TA-095v2 to 620 fix This is a small Description offer by the Developer himself on how to use Downgrading TA-095v2 to 6.20 FIX for your PSP .
1. Look for FuseCFG by PSPIdent.
2. If your FuseCFG: 0x00002A00, you can downgrade you PSP by Davee’s Chronoswitch Downgrader v5.0f.
3. If your FuseCFG 0×00003300, 0x00003B00 or other, download pre-downgrader-fix, install and press X.
4. After using PRE-Downgrader, you can use Davee’s Chronoswitch Downgrader v5.0f for downgrade.
PSP - TA-095 / 09g Upgrader Fix.
TA-095 - 09g Physical Upgrader has been released by developer Frostegater, this tool will help PSP-3000 TA-095 (09g) owner, who have downgraded with
Davee's Chronoswitch, and get an error IDXFFFFFFFF when try upgrading back to the newer OFW 6.3x or 6.60.. I myself have not tried this, but some preach this worked..