[Nexus 6P General] OctaneZ:
My attempts:

fastboot flash boot 48B_A4.img
fastboot reboot bootloader
fastboot flash recovery twrp3_1_1_4Cores.img
fastboot reboot bootloader
fastboot reboot recovery

error... Google logo... then reboot.

fastboot --skip-reboot -w update image-angler-n2g48b.zip
fastboot reboot bootloader
fastboot flash boot 48B_A4.img
fastboot reboot

error... Google logo... then reboot.

fastboot --skip-reboot -w update image-angler-n2g48b.zip
fastboot reboot bootloader
fastboot flash boot 48B_A4.img
fastboot flash recovery twrp3_1_1_4Cores.img
fastboot reboot recovery

error... Google logo... then reboot.

I even tried:

fastboot boot twrp3_1_1_4Cores.img

to no avail.

error... Google logo... then reboot.

---

Everything is unlocked:

fastboot flashing unlock_critical
...
(bootloader) Device already unlocked!
FAILED (remote failure)
finished. total time: 0.027s

fastboot flashing unlock
...
(bootloader) Device already unlocked!
FAILED (remote failure)
finished. total time: 0.028s

---

In fastboot:

BL: angler-03.68
Basebasnd: angler-03.81
Product/Variant: ANGLER-VN2
Serial Number: <string>
CPU: MSM8994 0x20001
eMMC: 64GB Samsung
DRAM: 3072MB HYNIX LPDDR4
Console: NULL
Battery OK
Device is UNLOCKED
Qfuse status: ENABLED.
Off-mode-charge: ENABLED
Download Mode: DISABLED.

Thoughts?

---------- Post added at 09:28 PM ---------- Previous post was at 09:22 PM ----------

Oh, [MENTION=5288606]XCnathan32[/MENTION] can we get md5 or sha for the files in the future?

I thought I might have corrupt versions, so got from both mirrors and compared them... sadly they were the same (eg: not my problem)

tyr:/data/Android/N6P benc$ md5 *.img
MD5 (N2G48B_4Cores.img) = 1f0ef8b395c872cbdd8a4ea5af70735f
MD5 (48B_A4.img) = 999caa63f95e772229af902dc3425d5e
MD5 (twrp3_1_1_4Cores.img) = 9eaf1b7447ae640297392e75f731cba7

tyr:/data/Android/N6P benc$ shasum -a 1 *.img
79f6ecda9507b6c4b553f23a27e446d4ee5c866c 48B_A4.img
fee1d6214964e78b962c37812d870d0d22f88315 N2G48B_4Cores.img
566358ffc1cb53c812af7f6b77461716dfbc305b twrp3_1_1_4Cores.img

tyr:/data/Android/N6P benc$ shasum -a 256 *.img
dba830a9e2b7dc8691a25a2b43a0db5d6fd04fb3564a487ef324633c851af094 48B_A4.img
22eca00ddb9f60176141d3b31fdb5d0ba30ebe8b30e8d0d456b18891baa862d0 N2G48B_4Cores.img
d4e01739b5742bca186e94cefe20f4e7b97fb5f3053eda2befd0faf8eb60c09d twrp3_1_1_4Cores.img

EX_A4.zip:
MD5 (EX_A4.zip) = ce88f1d768e1977e781365983684589e
07d29d0e4f718a8d42e5bb5f2e0f687230524c10 EX_A4.zip (sha1)
f0cfcab3ec92201fc322089facc10fef159555ce5825838e53286fc28c19da0e EX_A4.zip (sha256)

---------- Post added at 09:50 PM ---------- Previous post was at 09:28 PM ----------

okay just tried this from PAGE26: https://xdaforums.com/showpost.php?p=73162447&postcount=259

but still boot looping:

tyr:/data/Android/N6P benc$ fastboot flash boot 48B_A4.img
target reported max download size of 494927872 bytes
sending 'boot' (12384 KB)...
OKAY [ 0.301s]
writing 'boot'...
OKAY [ 0.185s]
finished. total time: 0.486s
tyr:/data/Android/N6P benc$ fastboot flash recovery twrp3_1_1_4Cores.img
target reported max download size of 494927872 bytes
sending 'recovery' (16948 KB)...
OKAY [ 0.416s]
writing 'recovery'...
OKAY [ 0.249s]
finished. total time: 0.665s
tyr:/data/Android/N6P benc$ fastboot format userdata
Creating filesystem with parameters:
Size: 58688266240
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 14328190
Block groups: 438
Reserved block group size: 1024
Created filesystem with 11/3588096 inodes and 271280/14328190 blocks
target reported max download size of 494927872 bytes
erasing 'userdata'...
OKAY [ 0.390s]
sending 'userdata' (141002 KB)...
OKAY [ 3.075s]
writing 'userdata'...
OKAY [ 2.149s]
finished. total time: 5.614s
tyr:/data/Android/N6P benc$ fastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.022s]
finished. total time: 0.022s

Picked recovery in fastboot.