This is a tutorial on how to bypass iCloud on iPad Mini 3 4G, 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 3 since this is a hardware method.
Warning! Be careful. If you are unsure of your skills, entrust this work to professionals.
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Disconnect the battery and take out the motherboard.
On the iPad Mini 3 4G Model A1600 you must remove the resistor 1 , then solder it the position 2; or instead of soldering the resistor, just make a jumper in position 2.
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 3 4G model A1600 .