I got a phone from ebay that was on 3.1.2. It had a bunch of apps and songs on it and it was even jailbroken but it did not have SHSH saved. I checked and saw it was old bootrom so I thought I could restore it with a custom 4.1 ipsw to preserve the 05.11.07 baseband. I put it into pwned DFU mode and used tinyumbrella to start a TSS server. It goes through the restore process and then goes back to DFU mode after the loading bar fully loads. I can't use tinyumbrella to kick it out of this state. Will I have to restore to stock 4.2.1?
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Restore 3gs custom 4.1 ipsw
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You need 4.1 SHSH files saved if you wish to restore to 4.1. Since you don't, you will have to go to 4.2.1, but since you have a old bootrom 3GS, it will be untethered. Do everything the same except use a custom 4.2.1 firmware file (one that keeps your current baseband).