500 internal Server Error

I was copying 3400 F5 with version 9.4.5 .usc file to 3400 F5 with version 9.1.2 , it was giving me error that it will not be completely upload to system as .ucs file version is newer then the machine on which you are uploading so i left it, then manually i was creating Virtual Servers,and then i created Pools but when i created one pool members it was giving me error of SNAT i left that pool, then i go to irule i was manually creating one with same name as it was on the F5 which .usc file i was trying to upload but it give me error of name i again left it and i was talking on phone with me senior when i came back i found that error on my GUI: 500 internal Error bla bla bla i tried many times i restarted softly and through button but again i have same error on GUI and from LCD IP address and Netmask was also converted to 0.0.0.0 and on LCD alarm came unit is going to active ????????