To revert to a stable version if a new update is buggy.
If you can access the menu, you can often go to Settings > Software Upgrade > USB Upgrade and select the .bin file (extracted from the .rar ). Download Dump Startrack Hyper SPHE 1506 DDRII BOX rar
To fix a "Red Light" error or "No Boot" issue caused by a failed software update. To revert to a stable version if a new update is buggy