Booting ailing 2018 MBP utilizing Goal Disk Mode from a 2011 iMac working Excessive Sierra – Further assist wanted please

I’ve numbered every level – as there are loads – within the hope it makes it simpler to answer or ask me for additional information. Thanks!

1. The Downside
2. What I’ve Tried So Far…
3. Subsequent Steps?
4. Screenshots

The Downside

2. 2018 MBP Is not going to boot utilizing Web Restoration, nor another sort of Restoration to date.
3. Get number of errors – 1008f, 2300f, 2100f.
4. 2018 MBP is working Huge Sur (presumably a current beta model, icr)
5. Have up to date 2011 iMac to Excessive Sierra 10.13.6. It is transferring slowly, nevertheless it’s undoubtedly transferring. It is a 3.4 GHz Intel Core i7, 8 GB 1333 MHz DDR3, loads of free disk area – 1.76TB.
6. I’ve most essential stuff on the MBP backed up, however involved as a result of medical causes that very important issues might not have been backed up in current occasions – my eye has been off the ball considerably…
7. I actually wish to entry the Information on the MBP if I presumably can.
8. I worry the Logic Board would possibly be on it is manner, however hope I can salvage one thing.

What I’ve Tried Already

9. Up to date iMac to HS, to create bootable installer of Excessive Sierra utilizing Terminal instructions. It is Prolonged Quantity, not AFPS. Could make one other in AFPS if it would remotely assist.
10. MBP didn’t boot to it. Nonetheless brings up Community immediate which in the end appears to trigger the fail every time.
11. MBP seems to course of connecting the MBP to WiFi Community every time, however then produces number of error codes on the finish, even when utilizing bootable installer and Choice key.
    12 Have even put total Excessive Sierra OS on exterior drive, endeavouring to successfully use exterior drive as a Mac Mini with ailing MBP simply the display screen. Nope. Nonetheless desires to connect with to Community (that is for the Firmware, afaik?)
12. Have at present linked MBP to iMac utilizing Thunderbolt 3 cable and USB-C to Thunderbolt adaptor.
13. Endeavouring besides utilizing Goal Disk Mode.
14. Can see MBP Macintosh HD – Information in Disk Utility, however can not carry out First Support, nor Mount it. IMAGE BELOW
15. Even have a Drive titled Replace in externals, which appears to indicate the Information and ?(Huge Sur beta replace?) possibly? (I have never known as it Replace, and I am not fairly certain what it’s) IMAGE BELOW
16. Tried Terminal instructions to Confirm Information, getting quite a lot of Permission Denied errors. IMAGE BELOW
17. Tried diskutil verifyDisk disk2 which supplies:
    Unable to confirm this entire disk: A GUID Partition Desk (GPT) partitioning scheme is required (-69773)
18. Tried diskutil verifyDisk disk2s1 (that is the amount(?) with the information on) which supplies:
    "An entire disk have to be specified"
19. <mutters ‘make your bloody thoughts up…’>
20. Downloaded iBoysoft to try to recuperate information.
21. It might see the Information, however there is a padlock on the Drive and it is asking: "Please enter the password of your encrypted APFS partition" IMAGE BELOW
22. Questioning if it is a FireVault factor? I am unsure if it is switched on, on the MBP or not. Whether it is, I’ve completely no thought what the encrypted partition password is, nor the place I would discover such info.
23. Apparently, I can run iBoysoft Information Restoration in macOS Restoration mode.
24. I am unsure if this will probably be difficult as a result of I’m additionally utilizing Goal Disk Mode, quite than working iBoysoft straight on the affected MBP, as a result of I can not. A search of the iBoysoft FAQs fails to supply a solution to this question.

Subsequent Steps

26. Is there any level in creating one other Bootable Installer, this time as APFS, quite than Prolonged Quantity?
27. The place can I discover the encrypted APFS password information? (I am not satisfied I’ve one, however it could have switched on by default?) I’m a satan for recording passwords so if I used to be conscious this existed, I completely would have made a observe of it. What would it not appear to be format-wise?
28. And the place would I enter it for the Disk Utility or Terminal to have the ability to entry ‘MBP Macintosh HD – Information’?
29. Would coming into the command immediate sudo Fsck_APFS /dev/disk2s1 do something useful?
30. I’ve a 2019 MBP working Huge Sur which thoughtfully concurrently fell over. This occurred whereas I used to be awaiting supply of the super-fast Thunderbolt 3 cable to do the information switch. It has refused to modify on since, so I’m just about caught with the 2011 iMac as rescuer for now. (And sure, I’ve tried all the standard suspects NVRAM, SMC on the lifeless second MBP and many others)

I’m an absolute novice in any respect of this, so please communicate ** s l o w l y ** to me in easy phrases. That is my first put up and I am doing my greatest…

Screenshots