We have seen same issue in another system also of Lenovo. Error message is same there also.
We have tested every possibility of getting the data back from recovery process. We would like to perform one last step from WinPE as well as from Force Crypt Sector.
Here we need some help from you, what will be the sector start and Number of Sector from below details as well as on workspace.
Disk Crypt List:
Crypt List region Count: 1
Crypt List region 0 Start: 50270208
Crypt List region 0 Count: 449643104
Partition Count: 5
Partition 0 Type: GPT(0xEE)
Partition 0 Type Name: Unknown
Partition 0 Start Sector: 2048
Partition 0 Sector Count: 1021952
Partition 1 Type: GPT(0xEE)
Partition 1 Type Name: EFI System
Partition 1 Start Sector: 1024000
Partition 1 Sector Count: 204800
Partition 2 Type: GPT(0xEE)
Partition 2 Type Name: Microsoft Reserved
Partition 2 Start Sector: 1228800
Partition 2 Sector Count: 32768
Partition 3 Type: GPT(0xEE)
Partition 3 Type Name: Windows data
Partition 3 Start Sector: 1261568
Partition 3 Sector Count: 498651744
Partition 4 Type: GPT(0xEE)
Partition 4 Type Name: EFI System
Partition 4 Start Sector: 499913312
Partition 4 Sector Count: 204832
I think the main issue here is that all your partitions are GPT which is currently not supported for the boot partition of MDE 7.x:
Regarding decryption, that error shows that you most probably did not enter correct sectors or there is an issue with the table itself as per the guide:
I hope you made a full backup/clone of the disk before trying to decrypt because once started it is irreversible.
Most probably you need to decrypt only partition 3 - Windows data:
2 Microsoft reserved122880032768
3 Windows data1261568498651744
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