Eversolo has released differential packages via OTA for their model DMP-A6.
Eversolo DMP-A6 Firmware Download – DMP-A6 v1.4.32 to v1.4.76
Eversolo DMP-A6 Firmware Download – DMP-A6 v1.4.60 to v1.4.76
Eversolo DMP-A6 Firmware Download – DMP-A6 v1.4.70 to v1.4.76
Eversolo DMP-A6 Firmware Download – DMP-A6 v1.4.75 to v1.4.76