i have never jailbroken before...i did ios 6.1.2 with evasion ipad 2...it went perfect..mo problems..but when downloaded an app from cydia the ipad entered safe mode..now they are saying to restart..no matter how many times i do it its still in safe mode!!
You installed an incompatible app/tweak in Cydia. Match the tweaks/apps with the ones here on the list and match the version. Uninstall the ones that aren't supported.