From the Ugoos blog.
Full firmware image for the UT3+ available here. NOTE This firmware is only for the UT3+, not for the UT3 or UT3S. While I imagine this firmware will work on UT3(S) models, some features specific to those models may not work, largely related to HDMI Input function. This firmware is labeled UGOOS_UT3PLUS_V3.0.7. It appears to be 3.0.7 with additions to handle HDMI Input record and PIP functions. The UT3+ uses a different chip to handle HDMI Input than the UT3 does.
Build number is dated 20160708.162212 release-keys.
UT3+ HDMI input record dialog...

UT3+ PIP function...

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