Silverware is an open-source flight controller firmware developed by GitHub user silver13 for the H8 mini, BWhoop B03, Eachine E011, and E011C FCs. It was forked and further refined by GitHub user NotFastEnuf. It gives you acro mode, is optimized for the STM32F0 processor and is very well-tuned for brushed motors (especially the NotFastEnuf fork).