I believe I have a one of those as well¡ It¡¯s just that Yamaha only released 1.37 publicly¡ version 1.38 just was never released, but was installed if they were manufactured very late in the cycle¡ maybe it just had something to do with an alternate (minor) chip being used on the very last production run¡ but that¡¯s a total guess¡ More likely, they just stop making it and they didn¡¯t invest the resources to put that last firmware update out publicly.
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¡°The longest journey starts with the first step." ?- Lao Tzu
Eric