when I tried 'fastboot flashing unlock' it said I needed to enable oem
   bootloader unlocking.
   I booted into a factory rom and did this under developer settings,
   doing the dance of repeatedly tapping the build number.
   maybe this was why it wouldn't boot with partition changes?
   it's 1414 and it just flashed a v207 with fastboot.
   when I boot it it successfully shows the unihertz logo, better than
   when I change the recovery partition which just gives me a black
   screen.
   it's 1415 and now I have an android logo which goes to desktop !!!!!!
   I don't know what I was going wrong before. maybe v222 doesn't work.
   1416
   1419
   I used fastboot to also flash the recovery partition with twrp. it
   appears to still be failing to boot under this condition. actually it
   has a black screen and won't seem to shut down or power up at all.
   1421
   I guess the thing to do is to wait for the battery to die and then
   reflash it with the factory recovery partition using the official tool.
   it looks like the device it offers the official tool is likely an
   MT65xx Preloader, 0e8d:2000