Respring loops are generally easy to recover from after installing a buggy jailbreak tweak.
A respring loop is when your iPhone appears to respring repeatedly without ever fully starting back up again.
There are a few different steps you can take to fix a respring loop.
Since most jailbreaks depend on the user re-jailbreaking the device after a hard restart, this can be used to your advantage if you’re stuck in a respring loop.
If a respring loop isn’t responding, and you have OpenSSH installed on your jailbroken device then you may be able to use a terminal application on your computer to kick it out of a respring loop.
If you don’t have access to OpenSSH one nuclear way to win this battle with a respring loop is to simply let the battery of the device in question run out.
After the battery dies, you can charge it back up and the device should then boot back up into a non-jailbroken state.
Various jailbreaks support no jailbreak tweak mode which allows all jailbreak tweaks to stop working and you can remove the offending jailbreak tweak from your package manager.
Respring loops are never fun, but the good news is you aren't completely out of options when it happens to you.
Take your time to troubleshoot, and you just may recover from it unscathed.