Thanks useful information: 
If this is the E-M1 (& not E-M1 II), then FW 4.3 update addressed a situation when using Keystone Comp.
However, the FW is now at 4.6.Corrected the following problems that occurred in version 4.2:
Misoperation when shooting with HDR, Focus Stacking, Hand-Held Starlight, or Keystone Comp. while Rec View is set to Off.
* The camera functions are the same as version 4.2.
If you really wanted to do a reinstall from the SD card, then LightSnowDev allows you to do that, but I don't think it would be necessary, however, it's there if you need it. It even lets you do earlier updates, but I wouldn't recommend going backwards though.
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