The v5.5 release improves the "bootrom-exploit" stability, significantly reducing the infamous "DA sent but no response" error. Based on changelogs and community testing, MTK Client v5.5 works reliably on:
python mtk.py da seccfg unlock
python mtk.py print This dumps chip info, RAM size, and serial number. mtk client tool v5 5
python mtk.py frp