Last updated Jun 8, 2026

Chronoswitch#

Chronoswitch is a tool that lets you install or reinstall official PSP firmware. It is useful in the following scenarios:

Reverting to an older firmware (e.g. 6.61 to 6.60)
Removing Infinity and/or custom firmware to revert to stock
Removing Infinity v1 to install Infinity v2
Removing custom firmware to install ARK-5

Before you start#

There are always risks when modifying firmware. Reduce them by:

Having at least 80% battery life
Making sure your battery cannot fall out during the process
Keeping the charger plugged in

Downloads#

Chronoswitch↗
Firmware files: 6.60 and 6.61↗ or other versions↗

Do not downgrade to firmware below 6.20. This guide has been tested with 6.60 and 6.61.

Steps#

1. Download the correct firmware file

Download the firmware version you want to install. The PSP Go uses a different update file than all other PSP models. Make sure you get the right one for your model.

If your file is not named EBOOT.PBP, rename it to EBOOT.PBP.

2. Transfer the firmware file

Transfer the firmware file to your memory stick at the following path:

PSP/GAME/UPDATE/EBOOT.PBP

PSP Go users can place the file on internal storage or the memory card.

3. Transfer Chronoswitch

Download Chronoswitch.zip, extract it, and copy its EBOOT.PBP to:

PSP/GAME/Chronoswitch/EBOOT.PBP

Create the Chronoswitch folder if it does not exist.

4. Run Chronoswitch

Disconnect from USB mode. In the Game tab on the XMB you will see both the Chronoswitch application and an entry for the firmware version you are installing. Open Chronoswitch and follow the on-screen instructions, pressing X to continue.

The PSP will load the official firmware installer. Follow the steps on screen. Once complete, the PSP will restart on the firmware version you chose.

Credits#

DaveeFTW, Krazynez, TheZett, Darth Sternie, some1, bbtgp, coyotebean, kgsws, Silverspring, Bubbletune, qwikrazor87