@AppLee
i saw "Rob Braxman" live on youtube he talked about the pine phone and said to look on the bright side , if it doesnt work , youve got a raspberry computer with a screen on and .... or words to that effect.
(he has one on order ) he is a cyber security guy

@kugiigi
it should not matter until after jan , by the time "Braveheart" gets played with for a week or 2, then ,when the ones come out with an OS in them . Marius will have it all fixed by then

https://www.getdroidtips.com/stock-rom-zyrex-zt-918/

this is for a different device :- but shows what to do with flashtool.
go there scroll down half the page ,and there are 2 links , one for pics the other to a video .
turn your sound on , so you can hear what happens when you connect your device
make connecting your device ,the last thing you do , ie press the download to start everything, then plug the device up,and watch and listen, if no activity after 10 secs or so,try to turn device on or off . flashtool should start working and take control .
anybody got more info for using 16:04 ( modemmanager etc)

@Angela_92
i mean the version on your laptop .
ok ,so you are you familiar with flashtool.....
it seems to me, that your adb connection was not good.
you can reflash android , and start again, or see the link,and flash TWRP, ( that way you still need someone to supply you with a TWRP backup.
the link has the latest android and TWRP.
there are lots here to help you ( i have the FHD ,so my stuff willl not work on yours)
we are all here to help

this is from pine64 forum 7 hrs previous ~ note its the dev version

Just received my dev pinephone. Pretty nice hardware from my point of view. Software is far to be usable. Tested it with postmarketOS and UBports. Camera, calling etc etc are not supported now. PostmarketOS gets "screen of death" very fast. UBports is a little bit more usable but there is a bug with onscreen keyboard that does not appear after several screen locks. Will test it with different desktop oses (debian, kali etc) until situation will change.

try this link
https://www.getdroidtips.com/flash-twrp-recovery-mediatek-sp-flash-tool/

i can supply a link to the files you need . later......
https://drive.google.com/open?id=1zWw8tVifUowrDXOx6UOZxIoN9icMKqN1
While i think of it, you should tell us what version of linux you are using, as this can give a problem also ( modemmanager)

i have the m10 fhd
you should use the spflash tool to reflash android ,and start again .
if you have never used flashtool . it can mess up your wifi if you use the wrong setting.
dont worry about it boot looping,, you set up fashtool with your device disconnected , press the neccessary buttons and then connect it, and as it bootloops it will trigger flashtool to do ," work"
I will look for a link to help with visual aids

http://4pda.ru/forum/index.php?showtopic=469340
(this will need translating ) but it has very explicit instructions on how to fix devices through SPFLASH tool
maybe save the link for a rainy day

@MarkG_108
I have had this ,it usually changes after a couple of reboots
Pro 5 and m10 fhd

I find with sailbook ,i start it and get a blank page ,I hit the refresh at the bottom of the page then ,ok from there, I don't get much in the way of adverts