hi thanks its working after flash with this unlocked bin file but now stuck in boot loop but working fine in safe mode and serial number is missing pls if any solution
How much time?
Try to reset SMC.
* Shut down the computer.
* Plug in the power adapter.
On the built-in keyboard, press the Shift, Control, and Option keys on the left side and the power button, all at the same time.
Release all three keys at the same time.
* Turn on the computer.
Something like this?
"
DRMStatus: iTunes/Apple Store Content Access Problem. Content playback may be disabled on this computer. You can continue to use the machine, but you should contact an Apple support representative. ErrorCode: 8877652
"
Would you like to provide output for 'nvram -p' in single user mode? You can boot into single user mode mount USB flash and drop file with command output on it.
But... Ok, lets analyze what we are did. We are take a firmware and replace one piece of code to another: 0x2000 bytes. I know that sometimes BIOS re-flashing may be a reason for boot delay, but this delay appear between screen light up and Apple logo is displayed. No over issues... before now. Some kext failed to load... Which?
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pls if any solution 
(Y) 
but take time to start not quick as before 