Here firmware history of E-M5 (Mark I)
Ver.2.3 (Dec.18 2018)
Corrected issue of autofocus (AF) function not operating correctly when using the “H-ES200” and “H-ES50200” interchangeable lens produced by Panasonic.
Ver.2.2 (Jan.28 2016)
Compatible with Olympus lens with a built-in image stabilizing function.
* The camera body recognizes the IS built into the lens, allowing for optimal image stabilizing effects.
* Not compatible with 5 axis Sync IS.
* You can get the effects of rolling stabilization from the IS function of the body, along with the effects of image stabilization from the IS function of the lens.
Compatible with Windows 10.
Ver.2.1 (Nov.13 2014)
Precision of AF when M.ZUIKO DIGITAL ED 40-150mm F2.8 PRO lens is mounted has been improved.
Ver.2.0 (Jan. 29, 2014)
Small AF target (icon) was added to the AF target settings.
ISO LOW (100 equivalent) was expanded on the low sensitivity side.
Ver.1.7 (Jun. 12, 2013)
Supported VF-4 electronic view finder.
* Automatic display switching by the eye sensor is not supported.
Ver.1.6 (Feb. 19, 2013)
The highlight and shadow control function was modified so the exposure settings are applied correctly at ISO 2000 or higher.
The issue that occasionally prevented operations during long exposures was resolved.
Ver.1.5 (Oct. 2, 2012)
Operating sounds in the photo ready mode were decreased.
Use of the Image stabilizer function by setting the Focal length of an OM lens attached with an adapter was enabled even in Movie mode.
All updates up to version 1.2 are included.
Ver.1.4 (Oct. 2, 2012)
Update functions for firmware version 1.2 have been modified. Camera functions are the same as version 1.2. After updating to ver. 1.4, please update the camera to the latest version.
Ver.1.3 (Oct. 2, 2012)
Update functions for firmware prior to version 1.1 have been modified. Camera functions are the same as version 1.1. After updating to ver. 1.3, please update the camera to the latest version.
Ver.1.2 (Jul. 12, 2012)
Improved sleep recovery operation.
AF target is indicated when using C-AF+TR while shooting sequential images using Sequential L.
Added function to automatically move zoom to the following zoom positions when underwater macro mode or underwater wide mode is selected.
(Only when M. ZUIKO DIGITAL ED 12-50 mm F3.5-6.3 EZ is attached)
Underwater wide mode: Wide setting
Underwater macro mode: Telephoto setting
Ver.1.1 (Apr. 18, 2012)
Issue of updates stopping while updating firmware has been resolved.
Image stabilizer function when using the following lenses has been modified.
ZUIKO DIGITAL ED 8mm F3.5 Fisheye
ZUIKO DIGITAL ED 18-180mm F3.5-6.3
LEICA D VARIO-ELMAR 14-150mm0