EFI - "computer is disabled" screen loop EMC 2925

Hi folks,

Would fancy some advice here.
Got an early 2015 Air A1466 (EMC 2925)
Boots to "Your computer is disabled" screen with timer going down from 60mins. Afterwards it just resets. No option to input PIN:




If attempted to perform NVRAM reset - goes to Firmware password screen. Same when attempting to use Option key for additional boot options. Can only generate hash key from this screen.

Very similar issue to the one discussed here: www.ghostlyhaks.com/forum/macbook-pro-retina-2015-2016/480-2015-macbook-air-unlocking-w-o-efi-flash-success

However option key does not work in my case hence as booting rEFInd w/o OS X boot disk.

Have computer on icloud/find, but it just sits there with "Locked" and rest is greyed out.
Apple support does not feel like helping without receipt of purchase.

Any options, other than Raspberry approach?

Except APPLE no way to unlock it by decode the the hash key. or upload the bios dump here we can clear the lock inside the dump to UNLOCK your Air.

At this point, dump can be acquired only with raspberry I assume?

What about brute forcing the pass? Rainbow tables?