A: Yes for existing license holders (perpetual licenses). Subscription users need an active maintenance plan.
Internal stress tests conducted post-update revealed significant improvements: zxdz 2021 update
Warning: If you purchased a "Blue PCB" ZXDZ from AliExpress in 2020, do not flash the official 2021 update. The manufacturer added a fuse check in v2.1.8 that permanently bricks counterfeit units lacking the original security IC. Legitimate "Green PCB" or "Red PCB" v3.2+ units update seamlessly. A: Yes for existing license holders (perpetual licenses)