I cannot speak strictly for your device, but on the other sammies I had, I held them until It either flashed twice, or went into the recovery/download mode. If you let go too soon, you will boot as normal
i have china andorid moses s8+ (spreadtrum phone) my phones firmware is distrubed (i moved one runnig app from phone memmory to external memmory so my phone does not boots it shows android logo then restarts
i want to know how to get rid of this ,i tried to go to boot loader but i see an attition sign and phone and no other option .
and second (by vol up )i go to factory tests. any body tell my how to fix this
one thing more my phone does not have pc driver plz help:'(