Oppo F11 Dead After Flash -

If you used SP Flash Tool or a commercial box (Easy JTAG, UMT, Medusa) and checked the wrong partition list—specifically, ticking PRELOADER , PGPT , or BOOT1 —you may have overwritten the Preloader with a mismatched or corrupt version.

Do not connect the battery immediately. Follow this order. oppo f11 dead after flash