Some minutes ago a firmware update for E-M1 (Mark I) version 4.6 was released. This is an adjustment of the version 4.5.
Ver.4.6 (Feb.14 2019)
The operation error while shooting at slow shutter speeds in firmware version 4.5 has been corrected.
Ver.4.5 (Jan. 24 2019)
Wireless radiowave commander FC-WR is now supported.