Unbrick LG K10 with boot partition deleted

I have an issue with my LG K10 (K430, MT6753). I was experimenting with it to learn the adb function. I accidentally erased the whole boot partition using rm, and then my phone is not booting anymore. It is showing the LG boot logo, but not starting up, keeps rebooting. I tried to: 1. Repair it through LG Bridge, to flash the stock ROM through LG UP and LG Flash Tool. But the phone is not staying in Flash mode or Download mode, and can't boot into Fastboot. The only thing that apparently works is the Factory Reset mode, but it only shows the interface. It only reboots the phone and nothing else. 2. Flash the boot image through SP Flash Tool, but have no luck. The phone is detected by Windows, but only for 3 seconds, then it disconnects. No matter what I do, when I connect the phone to my PC, it quickly disconnects, even with Driver Enforcement deactivated. I tried LG drivers and some other drivers for Mediatek, but still have no luck. Is there any other way to recover the boot partition's data or to unbrick my phone?