Hello guys i had the (chain[5] PIC need restore ... ) error and fixed it by using the IP Reporter Firmware restore, you can find it in Bitmain's Forum but i leave it here for all of you
IP Reporter Restore (The miner will automatically revert to factory default firmware)
This method is only applicable to the miner as below. (The SD card slot of the miner should be on the left of Ethernet interface.
Usage: Please power off the miner, then hold down the IP Reporter and dont release it. At the same time, please power on the miner. Releasing the IP Reporter after 5 seconds, the machine will automatically restore factory settings.
NOTE: This method is not applicable to the miner which has a SD card on the right of the Ethernet interface.
After i did that the pesky PIC error just went away.