I have a similar problem. My model is a ThinkPad X1 Yoga 4th Gen with i7 10710U. I solved the black screen issue by modifying the install EFI in this repository, but now it's stuck here:
09:863 00:069 AAPL: [EB|`LD:OFS] Err(0xE) @ OPEN (System\\Library\\PrelinkedKernels\\prelinkedkernel.development)
09:921 00:057 AAPL: [EB|`LD:LKC] BPDK,!R -> (System\Library\PrelinkedKernels\prelinkedkernel)
12:914 02:992 AAPL: [EB|`LD:LKFS] } Ok(0)
12:976 00:062 AAPL: [EB|`LD:LKC] } Ok(0)
13:391 00:414 AAPL: [EB|#FWFM] 0xFF1FFF3F
13:460 00:068 AAPL: [EB|#FWFT] 0xFC0FE137
13:518 00:057 AAPL: [EB|#CSR:OUT] 0x000003E7
13:577 00:058 AAPL: [EB|`BST:FBS] {
13:635 00:058 AAPL: [EB|`BST:FBS] BA.ADSZ: 0
14:055 00:420 AAPL: [EB|`BST:FBS] BA.KSDSZ: 0
14:124 00:069 AAPL: [EB|`B:WFDW] Err(0xE), 0 @ LocHB 71B4903C-14EC-42C4-BDC6-CE1449930E49
14:183 00:058 AAPL: [EB|#LOG:DT] 2020-04-20T13:59:44
14:241 00:058 AAPL: [EB|#LOG:EXITBS:START] 2020-04-20T13:59:44
My EFI:
CLOVER.7z
