I brick my Lenovo S820 :(

Hi, I bought a new Lenovo S820 and I wanted to upgrade FW cause my phone was without GSM signal (bad modem firmware probably).. So I installed MobileUncle tools, flashed a new recovery, rebooted phone and from that time I have a boot loop. Just Lenovo logo for few seconds, reboot, again logo.. infinite loop. I tried connect my phone for flashing in SP tool, so I push volume up, without battery and on USB, device is found in my laptop, but after few seconds it disappear from system, so I cant install drivers, flash device, anything.. I do not know, what I can do more.. Factory mode is full in chinese and nothing what I do there helps. Recovery doesnt work. Please, any advice? 
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Hi, ok, so for someone in future with similiar problem
1. power off your phone (put off battery and put it back)
2. press power+volume down = you will see META MODE status
3. connect USB, install USB driver -  MediaTek DA USB VCOM Port
      . in case of Windows 8.1 as my case you have to > win+c > settings > change PC settings > update & recovery
        > reboot to recovery settings and there allow (choice no. 7) unsigned drivers
4. disconnect phone from USB, turn it off (batery out-in)
6. download official ROM data
5. run SP Tools, check DA DL check sum, select from unziped ROM datas scatter file, select in the window bellow all values and where is not path, click on the name of value and find file in ROM files
6. click on download, wait until status in status bar (on the bottom) will  "Searching" and then connect device (which is still powered off) 
7. wait for green pop up windows - success
8. unplug phone, now you can turn it on.. done
In additional you can via SP tool install recovery and then via recovery (power button+vlmup+vlmdown) install zip file with custom rom. 
Good luck.

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