Optimize your storage space for ZX551ML,ZE550ML,ZE551ML

If you often encounter storage is full or insufficient,please FOTA to the latest version for supporting this feature to optimize the internal storage in seconds to the best condition and status.

ZE550ML: V2.20.40.144(WW)

ZE551ML:V2.20.40.174(WW)/V2.20.40.174(JP)

ZX551ML:V2.26.40.52(WW)/V2.26.40.53(JP)

/V2.26.40.56(CN)