Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: How do I update firmware for my EPM2, because I cannot get the viewfinder to work at all on my camera?
Document: Had no documentation at all. I have a Ep-2 and needed to do a bit of research to find out how to update the firmware. Was quite pleased to find out that if you update while the viewfinder is on the camera (use storage setting on camera) that it automatically switched over to the viewfinder and could be toggled back to the camera LCD while the viewfinder was still in place.The quality of the optics was startling crisp. It lives up to all expectations.
I bought the VF-4 for an Olympus Pen E-P3: updated camera firmware to 1.7, slid on the VF-4 and was propelled into eyeball Nirvana! The 2.36 dot display is a knockout: remarkable clarity and the 1.48x magnification nips at the heels of a full frame DSLR viewfinder. You get a truly eyeball filling view!
It also helps stabilize the camera when you hold it up to your eye, rather than out at arm's length....And the image rendition in this EVF is truly excellent.One other thing....you MUST download and install the latest firmware update from Olympus for your PEN to recognize this EVF. (The only camera that does not need the update is the EP5).
yes, your camera needs it. You really understand why when you start to use it.It's fast, easy to install and for DSLR lovers it is a must have. This makes my PEN a better camera.Pros:easy to install, light, seems securely locked.Fast viewfinder, very clear and sharp. You can consult the setup from the same view eye.Cons:on E-PM1 the viewfinder does not work while LCD is in use.
This is a clear advantage EVFs have over OVFs, and that is to represent the image preview in the same medium as the target medium.Some reviews complain about slow update time, I experienced no such issues, I think those are dependent on the camera this EVF is paired with. I was able to track birds in flight with a 300mm lens with no issues. E-PM2 is a quick little performer which has no issues driving this EVF.Couldn't be happier.
I often shoot in bright sun and the e-pm2 was sometimes pretty difficult to use despite a decent screen, due to glare and bright sun, with the VF-4 on I can't get enough of composing photos with it.The ability to articulate the viewfinder upwards is marvelous as well, all of a sudden I feel like I am using a Hasselblad!
I have to start this review with a WOW! This viewfinder is amazing!I upgraded my e-pm2 (pen mini 2nd gen) to the latest firmware because I read it needed it. Popped the viewfinder on and that was it!
Only black model. In Europe it is still quite expansive. Probably the most expansive viewfinder outthere! (get it in amazon.con then...)
D-Solutions was quick to respond and authorized the return for a full refund. As I was about to run to the Post Office to return the VF-4, I did an Internet search to confirm the VF-4 was supported on the E-PL5. I found a review of the VF-4 on my camera that mentioned that the E-PL5 firmware has to be at V1.2 or the VF-4 wouldn't power up.
However, this works the same way as the two earlier EVFs in that respect on anything other than the EM5; and that is you do have to push a button on the EVF to activate it. The button is in an easy to access spot on the viewfinder, so that's not a big deal, though.If you have been thinking about getting an external viewfinder for your EPL or EPM series PEN, this is definitely the one to get.
Answer: Did you put the viewfinder on the camera then go to Olympus to update for firmware?  Be aware that the automatic switching wil not work on your camera so you should see the viewfinder and screen lit up at the same time.