Official comment
It's not possible to downgrade the firmware; the current version (1.43) is available here.
These are the updates from 1.30 to 1.43:
Ver.1.43 (19 October, 2017 Update)
[FIXED]
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Track playback speed sometimes did not return to the BPM displayed on the screen when Sync is enabled.
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A popping noise occurred during a LOOP with QUANTIZE and MASTER TEMPO enabled.
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A HOT CUE started after jumping to the LOOP-IN point when changing a LOOP BEAT LENGTH with QUANTIZE enabled.
[FIXED]
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Fixed certain issues during playback and track selection.
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Some issues when using SLIP HOT CUE.
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MASTER PLAYER SELECT (AUTO) support (TORAIZ SP-16 PRO DJ LINK feature)
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Search using multiple words by adding a space in the [SEARCH] category.
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Playback stopped when the jog was rotated during BRAKE in VINYL mode.
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Digitally distorted white noise occurred when playing certain .WAV files.
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Active loop activated a very short loop.
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Needle search jumped back or forward from where a finger was released.
- When connected via PRO DJ LINK to a device in a CDJ-2000NXS, some features of the CDJ-2000NXS2 were disabled.