LG G3 Does not boot into recovery

[vivaCalcium]

Hello i have been trying to revive dead G3 for 3 months.
My hard bricked device is D858HK.
I have downloaded the firmware required then extract using LG firmware extractor.
The problem is, it won't boot into download mode after i flash the partition using Boardiag v2.99a.
Only 1 version of firmware found on the internet which is LGD858HKAT-00-V10d-HKG-XX-SEP-15-2014-32G+0.TOT
When i flash partition using different firmware like VS985, it can boot into download mode.
Now i am clueless, is the file corrupt or something since it won't boot into download mode.
If i proceed with VS985 with LG UP, it give me another error.
I also try hex editor method, no success.
Can anyone suggest me what else i can do aside from dump this device into garbage.

 

[Rukbat]

The download partition may be the same for the D858HK and the VS985, but the Android partition isn't.

Look on eBay for a JTAG service that can handle the D858HK, and have them flash it for you. (A JTAG can flash a hard bricked phone as long as there's nothing physically or electrically damaged.)