This seems like a momentous day in the history of Android, no?
So how does that work if you can't change H-boot? I mean, if you unlock and change roms/kernels, then a new radio/ota comes out, what do you do? And if I understand correctly, no nandroids, or is that something that can be fixed down the road without s-off?
basically,the hboot allows changes to boot,recovery,and system. much like the revolutionary hboot,it protects itself from being overwritten(with some additional security) and it prevents the radio from being changed as well.
since recovery is now open,one can use the command
fastboot flash<recoveryname>.img to get a working recovery(clokwork,twrp,etc) and then flash the superuser files,much like rooting with revolutionary. nandroids work just fine,as does flashing roms. there is one hiccup- the "boot" image is not avaible to be changed by recovery,just by the bootloader(via the
fastboot flash command in fastboot). since the kernel lives in the boot image, the recovery is "launched" into flash memory
from fastoot via the command
fastboot boot<recoveryname>.img. this allows kernels and roms with new kernels to be flashed in recovery in a familiar manner
since a PC and a command window are needed,you wont have the luxury of being able to flash new kernels,roms with new kernels,or restore backups with different kernels(i presume) on the subway on the way to work
i hope that all made some sense
to aswer your questions about radios,otas: all youll need to do is relock the bootloader via
fastboot oem lock you can then run an RUU for the current acceptable firmware,and accept an OTA.
so,you will be able to update radios,but it will be a more complex process:
1) fire up PC. open command window
2)plug in phone
3)lauch recovery from fastboot
4)make a backup
5)reboot back to fastboot
6)lock bootloader via
fastboot oem lock
7)run ruu to get to current firmware
8)let OTA install new radio,or run newer RUU
9)unlock bootloader again. you can use your origina unlock code.bin file
10)reflash recovery in fastboot via
fastboot flash (actually this might be optional)
11)launch recovery from within fastboot via
fastboot boot
12)restore the backup you made before you locked your bootloader

13)*big sigh of relief*
so while htc dev unlock works for most of what most folks want to be rooted for,you might now understand a lil better the value of a truly unsecured s-off bootloader
