I see step 5 (last one) right? https://support.allianceblock.io/support/solutions/articles/80000747536-can-i-bridge-my-balbt-back-to-albt-with-the-alliancebridge-
Yes that is it, but this one has more details https://blog.allianceblock.io/how-to-bridge-your-albt-to-balbt-in-preparation-for-bnb-balbt-liquidity-mining-on-binance-smart-88ab3ec9261c