Sorry, but I exactly followed the instructions and tried two different USB sticks, still no success:
partition table looks good on both usb sticks:
1.
$this->bbcode_second_pass_code('', '
localhost / # cgpt show /dev/sda
start size part contents
0 1 PMBR (Boot GUID: 00000000-0000-0000-3850-020000000000)
1 1 Pri GPT header
2 32 Pri GPT table
8192 32768 1 Label: "U-Boot"
Type: ChromeOS kernel
UUID: BF53801A-0E87-AC41-BB82-D83B99A13272
Attr: priority=10 tries=5 successful=1
40960 32768 2 Label: "Kernel"
Type: Linux data
UUID: 551EFDBC-7FA0-9C44-80A0-2DCEA0DCF7D2
106496 31219679 3 Label: "Root"
Type: Linux data
UUID: 678FD148-F91A-3A4B-977C-62721EC78629
73728 32768 12 Label: "Script"
Type: Linux data
UUID: 87CCBC51-93B6-1F4B-98A9-48D2B26D1CAD
31326175 32 Sec GPT table
31326207 1 Sec GPT header
')
2.
$this->bbcode_second_pass_code('', '
localhost / # cgpt show /dev/sda
start size part contents
0 1 PMBR
1 1 Pri GPT header
2 32 Pri GPT table
8192 32768 1 Label: "U-Boot"
Type: ChromeOS kernel
UUID: D8B949AC-58EA-384E-A0D8-5F859D8E89D9
Attr: priority=10 tries=5 successful=1
40960 32768 2 Label: "Kernel"
Type: Linux data
UUID: 59F74C23-1BEA-A240-899B-42243F76B2DB
106496 31160287 3 Label: "Root"
Type: Linux data
UUID: 90A0F0F8-B545-3844-970C-973D2B58AB5F
73728 32768 12 Label: "Script"
Type: Linux data
UUID: E2DEFC5D-BC04-474F-A61B-7792797AE397
31266783 32 Sec GPT table
31266815 1 Sec GPT header
')
and the md5sum check according to the post above gave me the exact same result...
I copy/pasted all the instructions and am very sure that I did not make anything different than stated in the installation instructions...
Also, the USB 3 port was never used by me...
what could be going wrong? The beep at startup just tells me that u-boot is not happy with the kernel it should load... Is there a possibility that my u-boot does not like chained boot? Or maybe the nv_uboot-snow.kpart provided by google has changed meanwhile?