Iphone 3g stuck on apple logo

[buckeyenimmons]

OK so i have an iphone 3g which was jailbroken and unlocked and had winterboard and a couple of other apps on it. After replacing my back casing the iphone got stuck on the apple logo and constantly reboots after a few minutes. After restoring multiple times i finally got it to boot up, but then i had to jailbreak so i did that and after rebooting it froze again. Since then i've tried to restore in dfu mode countless times and nothing just the apple logo. I've heard that it may be a problem with winterboard and that i would have to set auto-boot to true but i tried that with ireb and nothing has happened anyone have any ideas?

[Cowboy]

What firmware are you jailbreaking on?

[buckeyenimmons]

im on a custom 4.21 fw that doesnt update my baseband from 5.13

[Captinsmooth]

Are you using pwnage tool or snowbreeze for the custom ipsw? You can try using tiny umbrella to kick it out of the loop it may work.
Unfortunately snowbreeze does not always play well with a 3g in my experience. It has been known to brick them.

[buckeyenimmons]

i am using ireb to allow custom ipsw restore. And i heard of tinyumbrella trying to kick it out but i cant get tinyumbrella to read it unless its in dfu or recovery and it does not allow me to kick it out because it says im not in recovery.