[Moto E5 Questions & Answers] H2-san:
So, here's the results. @sd_shadow

Noted script errors:

1. What's with primary-gpt failing validation? (Referring to the gpt file attached with the zip I downloaded.)

fastboot flash gpt <path-to-gpt>.bin

Everything else checks out okay.

[EDIT] Failed to mention that baseband is still not found.

Entire technical data:

PS D:\Android\Moto E5 Plus> fastboot oem fb_mode_set
>> fastboot flash gpt .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\gpt.bin
>> fastboot flash bootloader .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\bootloader.img
>> fastboot flash modem .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\NON-HLOS.bin
>> fastboot flash fsg .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\fsg.mbn
>> fastboot erase modemst1
>> fastboot erase modemst2
>> fastboot flash dsp .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\adspso.bin
>> fastboot flash logo 'D:\Android\MotoBootLogoMaker\MORE LOGOS\logo.bin'
>> fastboot flash boot .\lineage-18.1-20210921-nightly-hannah-signed\boot.img
>> fastboot flash system .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\system.img_sparsechunk.0
>> fastboot flash system .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\system.img_sparsechunk.1
>> fastboot flash system .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\system.img_sparsechunk.2
>> fastboot flash system .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\system.img_sparsechunk.3
>> fastboot flash system .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\system.img_sparsechunk.4
>> fastboot flash vendor .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\vendor.img
>> fastboot flash oem .\HANNAH_T_OCPS27.91_150_11_12_cid21_subsidy_MPCS_RSU_regulatory_DEFAULT_CFC.xml\oem.img
>> fastboot erase cache
>> fastboot erase userdata
>> fastboot erase DDR
>> fastboot oem fb_mode_clear
...
OKAY [ 0.002s]
finished. total time: 0.005s
target reported max download size of 535822336 bytes
sending 'gpt' (45 KB)...
OKAY [ 0.014s]
writing 'gpt'...
(bootloader) Validating 'gpt.default.xml'
(bootloader) Security version downgrade
(bootloader) Image primary_gpt failed validation
(bootloader) Preflash validation failed
(bootloader) Cancelling 'gpt.default.xml'
FAILED (remote failure)
finished. total time: 0.094s
target reported max download size of 535822336 bytes
sending 'bootloader' (7483 KB)...
OKAY [ 0.245s]
writing 'bootloader'...
(bootloader) Validating 'bootloader.default.xml'
(bootloader) Committing 'bootloader.default.xml'
(bootloader) - flashing 'emmc_appsboot.mbn' to 'aboot'
(bootloader) - flashing 'rpm.mbn' to 'rpm'
(bootloader) - flashing 'tz.mbn' to 'tz'
(bootloader) - flashing 'devcfg.mbn' to 'devcfg'
(bootloader) - flashing 'cmnlib.mbn' to 'cmnlib'
(bootloader) - flashing 'cmnlib64.mbn' to 'cmnlib64'
(bootloader) - flashing 'keymaster.mbn' to 'keymaster'
(bootloader) - flashing 'prov.mbn' to 'prov'
(bootloader) - flashing 'sbl1.mbn' to 'sbl1'
OKAY [ 0.647s]
finished. total time: 0.898s
target reported max download size of 535822336 bytes
sending 'modem' (76706 KB)...
OKAY [ 2.424s]
writing 'modem'...
OKAY [ 1.062s]
finished. total time: 3.490s
target reported max download size of 535822336 bytes
sending 'fsg' (1700 KB)...
OKAY [ 0.067s]
writing 'fsg'...
OKAY [ 0.104s]
finished. total time: 0.175s
erasing 'modemst1'...
OKAY [ 0.043s]
finished. total time: 0.046s
erasing 'modemst2'...
OKAY [ 0.047s]
finished. total time: 0.049s
target reported max download size of 535822336 bytes
sending 'dsp' (16384 KB)...
OKAY [ 0.525s]
writing 'dsp'...
OKAY [ 0.277s]
finished. total time: 0.807s
target reported max download size of 535822336 bytes
sending 'logo' (851 KB)...
OKAY [ 0.039s]
writing 'logo'...
OKAY [ 0.088s]
finished. total time: 0.132s
target reported max download size of 535822336 bytes
sending 'boot' (10632 KB)...
OKAY [ 0.346s]
writing 'boot'...
(bootloader) Image not signed or corrupt
OKAY [ 0.200s]
finished. total time: 0.550s
target reported max download size of 535822336 bytes
sending 'system' (520547 KB)...
OKAY [ 16.384s]
writing 'system'...
OKAY [ 6.625s]
finished. total time: 23.013s
target reported max download size of 535822336 bytes
sending 'system' (487219 KB)...
OKAY [ 15.335s]
writing 'system'...
OKAY [ 5.619s]
finished. total time: 20.959s
target reported max download size of 535822336 bytes
sending 'system' (510993 KB)...
OKAY [ 16.082s]
writing 'system'...
OKAY [ 6.586s]
finished. total time: 22.671s
target reported max download size of 535822336 bytes
sending 'system' (512535 KB)...
OKAY [ 16.132s]
writing 'system'...
OKAY [ 5.850s]
finished. total time: 21.989s
target reported max download size of 535822336 bytes
sending 'system' (80580 KB)...
OKAY [ 2.548s]
writing 'system'...
OKAY [ 0.907s]
finished. total time: 3.458s
target reported max download size of 535822336 bytes
sending 'vendor' (240000 KB)...
OKAY [ 7.560s]
writing 'vendor'...
OKAY [ 3.340s]
finished. total time: 10.904s
target reported max download size of 535822336 bytes
sending 'oem' (166744 KB)...
OKAY [ 5.255s]
writing 'oem'...
OKAY [ 1.907s]
finished. total time: 7.166s
erasing 'cache'...
OKAY [ 0.018s]
finished. total time: 0.019s
erasing 'userdata'...
OKAY [ 0.108s]
finished. total time: 0.109s
erasing 'DDR'...
OKAY [ 0.010s]
finished. total time: 0.011s
...
OKAY [ 0.002s]
finished. total time: 0.003s

UPDATE: This is interesting. Boot and recovery have now come back with bad key

Update 2: Weird. Stock ROM is encrypting prior to first boot.

Update 3: Used Lenovo Rescue Flash, now the modem service is just having a seizure. And my baseband version is missing, AND I'm back in dual-SIM mode. 💢