This is a tutorial on how to bypass iCloud on iPad Mini 1 3G, after following this guide your iPad cellular shouldn’t work but wifi, bluethoot and gps will remain working.
First thing is to disassemble your locked iPad Mini 1 since this is a hardware method.
Video made by Powerbook Medic
Disconnect the battery and take out the motherboard.
On the iPad Mini 3G Model A1454 you must remove the resistors r1204 r1205 and shunt the r1205 place; The same thing For the Model iPad Mini 3G A1455.
Connect your iPad to itunes
iPad will automatically enter in DFU mode.
You must restore your iPad Mini using iPad Mini wifi model firmware and follow the steps to activate it.
When successfully done, turn off the automatic firmware update.
As mentioned before this instructions are only for iPad Mini 1 with 3G module, Model A1454 and A1455.