[Pixel C Android Development] Peregr1ne:
HELP! cannot connect to Pixel while in fastboot

I guess I am one step closer as I have now succesfully unlocked the Pixel using "sudo fastboot flash boot", this did yield one error "error: ANDROID_PRODUCT_OUT not set" wether or not this will be an issue later on is nog clear to me.

With the Pixel still in fastboot mode I tried to flash twrp onto it, still using linux as it seems impossible to find working windows drivers, this however still gives the same FAILED error as before:

[FONT="Courier New"]sudo fastboot flash boot /home/knoppix/Desktop/KNOPPIX/parking/platform-tools/twrp.img
target reported max download size of 268435456 bytes
erasing 'boot'...
FAILED ([B][COLOR="Red"]remote[/COLOR][/B]: unsupported command)
finished. total time: 0.002s[/FONT]

After this the tablet got into a bootloop for a while, eventually resolving itself and showing the first startup & login screen (stock).

In bootloop it cycled through the following screens - after some time I got back to the first startup/login screen:

Google-bar-colours shown and the text "Bootloader is unlocked and OS verfication is OFF. Device will continue to boot in 30 seconds."

moving circles showing text "Wissen" (Dutch for erasing or wiping) below

moving circles showing text "Geen instructie" (Dutch for no instruction) below

I think I have exhausted all the possible routes I can think of, tinkering with various Windows drivers, with Linux in a (virtual) box, and finally using a pendrive distro: in all cases I seem to end up in the same situation: when I want to flash twrp it appears as if the tablet can no longer communicate or respond (correctly) to the pc...

Anyone any suggestions? Pretty please?

Full details below:

[FONT="Courier New"]sudo fastboot getvar all
(bootloader) version: 0.3
(bootloader) version-bootloader: Google_Smaug.7900.139.0
(bootloader) version-baseband: N/A
(bootloader) product: dragon
(bootloader) secure: [COLOR="red"][B]yes[/B][/COLOR]
(bootloader) max-download-size: 0x10000000
(bootloader) partition-type:boot: ext4
(bootloader) partition-type:kernel-a: ext4
(bootloader) partition-type:kernel-b: ext4
(bootloader) partition-type:recovery: ext4
(bootloader) partition-type:kernel: ext4
(bootloader) partition-type:system: ext4
(bootloader) partition-type:system-a: ext4
(bootloader) partition-type:vendor: ext4
(bootloader) partition-type:vendor-a: ext4
(bootloader) partition-type:cache: ext4
(bootloader) partition-type:data: ext4
(bootloader) partition-type:userdata: ext4
(bootloader) partition-type:metadata: ext4
(bootloader) partition-type:lnx: ext4
(bootloader) partition-type:misc: ext4
(bootloader) partition-type:persistent: ext4
(bootloader) partition-type:system-b: ext4
(bootloader) partition-type:vendor-b: ext4
(bootloader) partition-size:boot: 0x2000000
(bootloader) partition-size:kernel-a: 0x2000000
(bootloader) partition-size:kernel-b: 0x2000000
(bootloader) partition-size:recovery: 0x2000000
(bootloader) partition-size:kernel: 0x2000000
(bootloader) partition-size:system: 0xe0000000
(bootloader) partition-size:system-a: 0xe0000000
(bootloader) partition-size:vendor: 0x13000000
(bootloader) partition-size:vendor-a: 0x13000000
(bootloader) partition-size:cache: 0x19000000
(bootloader) partition-size:data: 0xd76b00000
(bootloader) partition-size:userdata: 0xd76b00000
(bootloader) partition-size:metadata: 0x4000000
(bootloader) partition-size:lnx: 0x2000000
(bootloader) partition-size:misc: 0x400000
(bootloader) partition-size:persistent: 0x80000
(bootloader) partition-size:chromeos: 0xe8f800000
(bootloader) partition-size:mbr: 0x200
(bootloader) partition-size:gpt: 0x4200
(bootloader) partition-size:RO_SECTION: 0x3f0000
(bootloader) partition-size:RO_VPD: 0x10000
(bootloader) partition-size:RW_SECTION_A: 0x580000
(bootloader) partition-size:RW_SECTION_B: 0x580000
(bootloader) partition-size:bootloader: 0x1000000
(bootloader) unlocked: [COLOR="red"][B]yes[/B][/COLOR]
(bootloader) off-mode-charge: 1
(bootloader) battery-voltage: 4139 mV
(bootloader) variant:
(bootloader) battery-soc-ok: yes
(bootloader) Bdev-size:mmc: 62537072640
(bootloader) Bdev-size:flash: 16777216
(bootloader) Gbb-flags: 0x0
(bootloader) Oem-version:RO: Google_Smaug.7132.226.0
(bootloader) Oem-version:RW_A: Google_Smaug.7900.139.0
(bootloader) Oem-version:RW_B: Google_Smaug.7900.139.0
all: Done!
finished. total time: 0.261s[/FONT]