my iphone is hang after I try to replace original iphone font

[spiron]

Need some help, after I try to replace original iphone font(iphone 1st gen) with my local font(Thai font). After my iphone is reboot it keep to loading something and I can not do anything. If I waiting it for 2-3 minute, my iphone is reboot by itselfe and hang in process during boot(iphone try to loading somthing)

[JFrappuccino]

Place the phone into recovery mode.
Restore from there to 2.2 firmware.
Do not load the thai language to avoid problems.