Error 21 and Unable to boot discs

[BobsYurUncle]

Hello there, 

I'm hoping to receive some help from you fine experts. First time modding an Xbox and unfortunately I think I made a blunder. Ended up with a service required error 21 screen and discs will not boot.

After softmodding with Rocky5's tools I copied over Xblast OS and Cerbios to my C drive. Now the C drive partition was extremely small and wouldn't fit the bios bin so I temporarily removed what looked like some Japanese language files, I suspect this is why I'm receiving the error. Didn't have a mod disc, plan was to just FTP everything over.

Was attempting a TSOP for the first time, and I had a Sharp model motherboard so I tried once and got no boot then decided to undo my bridges and just go the modchip route. I should also mention I recapped the CPU and removed the clock capacitor, I don't think this would cause such an error but other people might know better. So after undoing my TSOP bridges I was met with the error screen, whoops.

So trying to salvage this, I don't have really any spare parts to try swapping, I suspect the route forward is to buy an IDE interface for my PC to reformat the HDD. Or would it be possible to just install a modchip at this point since I intend to install a large sata drive anyways. 

I did backup the eeprom and nullify the hdd key as well.

Any advice/words of wisdom on how to proceed greatly appreciated. Thanks.

 

[JackedLynx]

On 7/28/2022 at 5:02 PM, BobsYurUncle said:

Hello there, 

I'm hoping to receive some help from you fine experts. First time modding an Xbox and unfortunately I think I made a blunder. Ended up with a service required error 21 screen and discs will not boot.

After softmodding with Rocky5's tools I copied over Xblast OS and Cerbios to my C drive. Now the C drive partition was extremely small and wouldn't fit the bios bin so I temporarily removed what looked like some Japanese language files, I suspect this is why I'm receiving the error. Didn't have a mod disc, plan was to just FTP everything over.

Was attempting a TSOP for the first time, and I had a Sharp model motherboard so I tried once and got no boot then decided to undo my bridges and just go the modchip route. I should also mention I recapped the CPU and removed the clock capacitor, I don't think this would cause such an error but other people might know better. So after undoing my TSOP bridges I was met with the error screen, whoops.

So trying to salvage this, I don't have really any spare parts to try swapping, I suspect the route forward is to buy an IDE interface for my PC to reformat the HDD. Or would it be possible to just install a modchip at this point since I intend to install a large sata drive anyways. 

I did backup the eeprom and nullify the hdd key as well.

Any advice/words of wisdom on how to proceed greatly appreciated. Thanks.

 

21 is a dashboard error. have you tried reformatting the drive, and then reinstalling the dash?