Any way to load bootloader with broken Vol-?

Hello guys. I got bootlop on my TF300TG (i think it's because i made some wrong wipes from TWRP) and now i can't do anything with the tablet. There is a broken Vol- button, i've get to bootloader from Anrdoid with "quick reload" app. Is there a way to load bootloader with broken button?
Tablet always shows splashscreen so adb is unavailable.

Boot loop and E: failed to load cache(no file or directory)

My canvas A1 is in bootloop.
after enter in recovery. i found text as below.
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: failed to mount /cache(no such file or directory)
E: Can't mount /cache/recovery/last_log
E: Can't open /cache/recovery/last_log
E: failed to mount /cache(no such file or directory)
E: Can't mount /cache/recovery/last_install
E: Can't open /cache/recovery/last_install
E: failed to mount /cache(no such file or directory)
E: Can't mount /cache/recovery/last_kmsg
E: Can't open /cache/recovery/last_kmsg
E: Can't open /dev/block/platform/mtk-msc.0/by-name/para (no such file or directory)
E: failed to mount /cache(no such file or directory)

I try to flash lollypop by sp flash tool 100% completed without error but result is same.
plz some one help me.

HELP - My phone is bricked - cannot load recovery mode... ;(

Hello,

I loaded my SM-G900F with a custom rom and it suddenly died... There is no way to switch it on and when I connect it to my laptop it shows QHSUSB_BULK under device manager. I read a lot of posts and I understand that I need an unbrick image to boot from an sd card. Is that the right thing to do?

I would really appreciate is somebody could help.

Thanks in advance!
buralbe

Lenovo A536 wont load

Greetings,
I have Lenovo A536 android 4.4 smartphone rooted with Kingroot app
I tried to update vibeUi this morning despite the warning of rooted device.Update failed and i removed the battery when screen stopped cause device didnt turn off from power button
>Phone now enters only Boot recovery menu and reaches till lenovo logo.The phone doesnt recognise SD Card
I tryed to wipe data/factory defaults and cache so far from boot recovery menu.The other options didnt work.
>Tried so far stock roms A536_S175_150105_ROW
, A536_S147_140910_ROW with Smart Phone Flash Tool a
nd Sp Flash Tool without any luck.Also Installed SDK Tools with 4.4.2 and run through CMD line
but commands wont respond.(trying adb bridge)
Please provide me with info explain me with details what should i do, because i am total amateur using
android tools.I know it was dumb to do those things to phone so i am paying the price now (The warranty of the phone is on if i messed it badly).
Thanks in advance.

need to load keystroke logger .....AKA spy software on to phone,

Need to load keystroke logger onto a target phone.......all of the good software packages say that phone needs to be rooted. Any one know of good program that does not require rooting. anyone know of one that does not require rooting.