No Mom should be without her Apple TV! This one is for Dear Old Mom…
You should definitely be able to save your Mom’s 5.1 signatures and successfully complete an UNTETHERED jailbreak.
Unfortunately, “Jailbreaking 101” is not updated and doesn’t reflect the process using SP 9.3.
Before attempting anything else, you should save the signatures. You can choose that option with Seasonpass 9.3 by RIGHT CLICKING on the “Create IPSW” box and choosing “Save Firmware Signatures.” You will be asked to connect your Apple TV and put it into DFU mode. Seasonpass will do the rest and complete with a message saying that your signatures have been successfully saved. Only version 5.3 seems to present problems saving signatures in Seasonpass 9.3. You should have no issues saving your 5.1 signatures with SP 9.3.
You indicate, however, that you were unable to save the firmware signatures and got the message “extraction failed.” I’m wondering if you followed the same steps I outlined above – and whether you are using a proven Micro-USB. If you are, you should try again. Try using a PC if you are having issues with a MAC.
If you continue to fail for whatever reason, save your signatures using iFaith (1.5.9 is the latest version) which is very simple to use.
Once you have succeeded in saving your signatures – disconnect. Then reconnect and RIGHT CLICK on that same IPSW box and choose the 5.1 option from the pull-down menu. You will be asked to connect your Apple TV at which point the IPSW creation process will automatically begin.
Don’t even begin the process if you do not have the latest version of iTunes installed. If you don’t, you won’t successfully complete the jailbreak.
I hope there was something helpful for you here, JALance!