NGOCSON Hello. Unfortunately we don't have isp pinout for this device yet.
But LGE-H900 is easy to unbrick with UFI Box.
You can try UNBRICK using SD Recovery Boot methode at First
- Prepare Micro SDHC from well known brand, and insert it to UFI Lite
- Open UFI eMMC ToolBox, select UFI-Lite eMMC/uSD Reader as Interface

- Go to Factory Image Tab, make Identify eMMC at first, then select proper brand, model and firmware.
In your case, of course LGE H-900, and firmware for both KDZ and TOT is available in UFI support page, just download it.

- After you select LGE H-900 Firmware, UFI Software will auto extract the content.

- After extraction finish, now you can write directly to your SD card as SD Boot Recovery. To do so, checklist SD Boot Recovery, then press Write

- Your SD Boot Recovery now ready. Insert to your device, press vol up and connect to USB Data cable with your PC. It should go to DOWNLOAD Mode and you can flash using any LG Tool you have.
If SD Boot Recovery fail, then you can unbrick device by replacing the eMMC. You don't need eMMC Dump Files for replacing eMMC in LGE Devices. The methode is same as you create SD Boot Recovery in above, but UNCHECK SD Boot Recovery while you writing factory firmware to eMMC.
Resolder new eMMC, and your Device will be FULL ON Stage ;-)
Good Luck