[Google Pixel 2 XL Questions & Answers] hacktron:
Tried the above with no luck. I cannot side load OTA because I do not have access to adb, only fastboot. However I did try the deuces script two times, once to continue without unlocking and again with the to unlock bootloader options, but it failed to flash.

Deuces-flash-all-script-V4.5-Windows

for Taimen or Walleye - Google Pixel 2 / XL

USE AT YOUR OWN RISK

Press any key to continue . . .

Make Sure your Device is in Fastboot Mode

(Power off, hold Volume-Down, hold Power)

Once you are in fastboot,

Press any key to continue . . .

Unlock Bootloader[Y/N]?y

Running Unlock

Look at your device,

press up arrow and Power to confirm

FAILED (remote: 'Flashing Unlock is not allowed

')

Finished. Total time: 0.002s

This will say "failed" if already unlocked - ignore

Running Unlock_critical

Look at your device,

press up arrow and Power to confirm

FAILED (remote: 'Flashing Unlock is not allowed

')

Finished. Total time: 0.004s

This will say "failed" if already unlocked - ignore

Locating Bootloader and Radio Filenames

Flashing...

it is safe to ignore errors about active partition - there are multiple entries to support multiple versions of platform tools

Slot _a does not exist. supported slots are:

a

b

Setting current slot to 'a' FAILED (remote: 'Slot Change is not allowed in Lock State

')

Finished. Total time: 0.007s

Sending 'bootloader_a' (36336 KB) OKAY [ 0.824s]

Writing 'bootloader_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.836s

rebooting into bootloader OKAY [ 0.003s]

Finished. Total time: 0.006s

Sending 'radio_a' (60388 KB) OKAY [ 1.353s]

Writing 'radio_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 1.365s

rebooting into bootloader OKAY [ 0.004s]

Finished. Total time: 0.006s

Slot _b does not exist. supported slots are:

a

b

Setting current slot to 'b' FAILED (remote: 'Slot Change is not allowed in Lock State

')

Finished. Total time: 0.008s

Sending 'bootloader_a' (36336 KB) OKAY [ 0.820s]

Writing 'bootloader_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.831s

rebooting into bootloader OKAY [ 0.003s]

Finished. Total time: 0.004s

Sending 'radio_a' (60388 KB) OKAY [ 1.355s]

Writing 'radio_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 1.369s

rebooting into bootloader OKAY [ 0.003s]

Finished. Total time: 0.004s

Slot _a does not exist. supported slots are:

a

b

Setting current slot to 'a' FAILED (remote: 'Slot Change is not allowed in Lock State

')

Finished. Total time: 0.007s

Sending 'abl_a' (540 KB) OKAY [ 0.014s]

Writing 'abl_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.023s

Sending 'aes_a' (48 KB) OKAY [ 0.004s]

Writing 'aes_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.016s

fastboot: error: cannot load 'apdp.img': No such file or directory

Sending 'boot_a' (40960 KB) OKAY [ 0.885s]

Writing 'boot_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.895s

Sending 'cmnlib_a' (220 KB) OKAY [ 0.007s]

Writing 'cmnlib_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.018s

Sending 'cmnlib64_a' (288 KB) OKAY [ 0.009s]

Writing 'cmnlib64_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.016s

Sending 'devcfg_a' (60 KB) OKAY [ 0.004s]

Writing 'devcfg_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.016s

Sending 'dtbo_a' (8192 KB) OKAY [ 0.180s]

Writing 'dtbo_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.189s

Sending 'hyp_a' (264 KB) OKAY [ 0.009s]

Writing 'hyp_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.019s

Sending 'keymaster_a' (308 KB) OKAY [ 0.010s]

Writing 'keymaster_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.019s

Sending 'laf_a' (29800 KB) OKAY [ 0.648s]

Writing 'laf_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.658s

Sending 'modem_a' (60380 KB) OKAY [ 1.315s]

Writing 'modem_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 1.326s

fastboot: error: cannot load 'msadp.img': No such file or directory

Sending 'pmic_a' (52 KB) OKAY [ 0.003s]

Writing 'pmic_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.016s

Sending 'rpm_a' (232 KB) OKAY [ 0.008s]

Writing 'rpm_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.019s

Sending 'tz_a' (1868 KB) OKAY [ 0.042s]

Writing 'tz_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.052s

Sending 'vbmeta_a' (4 KB) OKAY [ 0.003s]

Writing 'vbmeta_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.012s

Sending 'vendor_a' (360340 KB) OKAY [ 7.858s]

Writing 'vendor_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 7.868s

Sending 'xbl_a' (2620 KB) OKAY [ 0.061s]

Writing 'xbl_a' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.073s

Flashing System A

Sending sparse 'system_a' 1/5 (524284 KB) OKAY [ 12.134s]

Writing sparse 'system_a' 1/5 FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 16.946s

Flashing System B

Sending 'system_b' (330216 KB) OKAY [ 7.412s]

Writing 'system_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 7.422s

Slot _b does not exist. supported slots are:

a

b

Setting current slot to 'b' FAILED (remote: 'Slot Change is not allowed in Lock State

')

Finished. Total time: 0.008s

Sending 'abl_b' (540 KB) OKAY [ 0.016s]

Writing 'abl_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.032s

Sending 'aes_b' (48 KB) OKAY [ 0.005s]

Writing 'aes_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.018s

fastboot: error: cannot load 'apdp.img': No such file or directory

Sending 'boot_b' (40960 KB) OKAY [ 0.924s]

Writing 'boot_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.939s

Sending 'cmnlib_b' (220 KB) OKAY [ 0.009s]

Writing 'cmnlib_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.020s

Sending 'cmnlib64_b' (288 KB) OKAY [ 0.009s]

Writing 'cmnlib64_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.020s

Sending 'devcfg_b' (60 KB) OKAY [ 0.004s]

Writing 'devcfg_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.017s

Sending 'dtbo_b' (8192 KB) OKAY [ 0.187s]

Writing 'dtbo_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.202s

Sending 'hyp_b' (264 KB) OKAY [ 0.009s]

Writing 'hyp_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.025s

Sending 'keymaster_b' (308 KB) OKAY [ 0.011s]

Writing 'keymaster_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.027s

Sending 'laf_b' (29800 KB) OKAY [ 0.672s]

Writing 'laf_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.689s

Sending 'modem_b' (60380 KB) OKAY [ 1.363s]

Writing 'modem_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 1.379s

fastboot: error: cannot load 'msadp.img': No such file or directory

Sending 'pmic_b' (52 KB) OKAY [ 0.004s]

Writing 'pmic_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.017s

Sending 'rpm_b' (232 KB) OKAY [ 0.007s]

Writing 'rpm_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.018s

Sending 'tz_b' (1868 KB) OKAY [ 0.044s]

Writing 'tz_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.053s

Sending 'vbmeta_b' (4 KB) OKAY [ 0.002s]

Writing 'vbmeta_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.011s

Sending 'vendor_b' (360340 KB) OKAY [ 8.112s]

Writing 'vendor_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 8.122s

Sending 'xbl_b' (2620 KB) OKAY [ 0.063s]

Writing 'xbl_b' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.078s

Slot _a does not exist. supported slots are:

a

b

Setting current slot to 'a' FAILED (remote: 'Slot Change is not allowed in Lock State

')

Finished. Total time: 0.009s

Format Userdata[Y/N]?

mke2fs 1.44.3 (10-July-2018)

Creating filesystem with 29518843 4k blocks and 7380992 inodes

Filesystem UUID: 40c24edc-c81a-11e8-8c97-ad6213ea0a12

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

4096000, 7962624, 11239424, 20480000, 23887872

Allocating group tables: done

Writing inode tables: done

Creating journal (131072 blocks): done

Writing superblocks and filesystem accounting information: done

Sending 'userdata' (4672 KB) OKAY [ 0.109s]

Writing 'userdata' FAILED (remote: 'Flashing is not allowed in Lock State')

Finished. Total time: 0.620s

Press any key to continue . . .

Finished Flashing... if you are still having bootloops, you may need to format userdata in factory recovery

DO NOT LOCK THE BOOTLOADER UNLESS YOU ARE SURE IT IS OPERATING PROPERLY