[Zuk Z1 Q&A, Help & Troubleshooting] tomdan95:
yes, it dosn't boot because there nothings to boot. upgreading from nightly to snap you have corupt system and recovery partition, you have to turn off your zuck and turn it on putting it in fastboot mode; wipe recovery partition and flash twrp, after that start the recovery twrp and from twrp wipe system and data partition and flash the snap zip in the system partition and reboot

---------- Post added at 03:11 PM ---------- Previous post was at 03:07 PM ----------

you can try to press volume + & volume - for force the fastboot mode

---------- Post added at 03:18 PM ---------- Previous post was at 03:11 PM ----------

if it dosen't work try to turned it off and keep the data cable to the computer disconnect, press: [volume down key] [Power Key] waiting to enter the fastboot mode.

---------- Post added at 03:41 PM ---------- Previous post was at 03:18 PM ----------

if all this things dosen't work last chance is install ZUI on your phone and when you have a working zui install COS or CM

for do that you have to:

0. Download the ZUI Full ROM file from here and extract to your computer. Here is the link https://mega.nz/#!fYYh0QDA!nYf0vvXpz...__vaHO_Weyg-YU

1. You need to install Qualcomm driver and ZUK Z1 driver to you PC, you can download it from this link https://mega.nz/#F!LcgDmRyC!4unf8UQqOBoZayAuv-D3Tg

2. The Qualcomm driver file shouldn't be signed so most of the windows operating system will not allow you to install, to install the Qualcomm driver you need to enable the unsigned driver installation.

If you are using windows 10 or windows 8. or 8.1 you can enable in this way. (go to the power option from the start menu hold the shift key from the keyboard and select restart option) for more information you can see this link http://www.howtogeek.com/167723/how-...igned-drivers/

If you are using windows 7 you can disable the driver signature verification from the boot menu. (when you see your computer motherboard name or pc logo just type F8 so there you can choose the option disable driver verification)

3. If you install the driver files successfully then you need to download and install the QFIL tool you can download the file from this link https://mega.nz/#!qIx0ybKC!YfeWZMHTF...8rEqDr5rEOYUc4

4.start QFIL from the QPST folder

5.Click browse on the programmer path row and select prog_emmc_firehose_8974.mbn from the directory where you unzipped the QPST ZUI ROM

and then click browse on the search path row and select the xml file + the other patch file which comes after it.

6. When thats done, make sure phone is off and then hold vol+ while you are inserting usb cable into phone and QFIL should then detect phone,

you may need to select port in the QFIL program and be quick with it, took me a few tries before I got it right so just take out the cable

and turn off and try again if you fail to make them connect.

Not only you need to select comport, you also need to press the download button aswell as soon as possible or else phone will continue booting as normal.

7.If everything went well then you should have ZUI loaded onto your phone and you are met with Chinese language as default.

On the first screen you are met with, just press the button in the bottom (on screen), then press cogwheel (which is the settings),

scroll down to yet another cogwheel in here which should be below a lock icon, then press second option in here and then the top option

to change language to english incase you cant make out the chinese and you should be good to go