Need Help to Unbrick my LG G2

[iSumair]

After trying to update my lg g2 (d800) using ota I bricked up my phone, following is the situation:

-- The phone keep restarting itself at lg logo (Bootloop)
-- No download mode is activated (using Volume Up + inserting usb cable) and instead it boots into system recovery 3e
-- I also believe the phone is still rooted as I did it before the phone bricked
-- No custom recovery was installed
-- Can't adb or fastboot, only sideload is available is system recovery 3e menu.

My question is can I
1. Flash any possible rom using adb sideload? (from system recovery 3e)
2. Flash TWRP or CWM using adb sideload?
3. Can I go to fastboot mode?
4. Can I flash any img files using abd sideload to get download mode?

I cant to stock using kdz or tot method.
Please give me any hints or ideas? Completely stuck right now

I posted these thread on XDA, please have a look

-- [Q] Need help to unbrick G2 D800 | LG G2 | XDA Forums
-- [Q] Flashing rom/custom recovery using Syste… | LG G2 | XDA Forums

 

[kaleem qadir]

TRY HARD RESET WITH HOLDING BOTH VOLUME BUTTONS AND POWER BUTTON ...... DEVICE WILL RESTART AND BOOT INTO BOOT LOADER THEN FLASH RECOVERY .... HOPEFULLY IT WORKS(w)