I've been holding off updating my Playbook to OS 126.96.36.19911 because there's three things I didn't want to lose: SSH access, Huluberry, and (most importantly) Google Market and full functionality of the Android Player via ADW Ex. Well tonight I had a few minutes to mess with it, and I found a way that you can update to OS 188.8.131.5211 and keep Android Market.
Just download the latest version of DIngleberry. Boot it up, and click the firmware button.
Select 184.108.40.20611, Core OS, download and install. That's all you have to do!
Remember that this WILL BREAK Huluberry and you won't be able to get root access (until the next version of Dingleberry I'm sure lol).
The cool thing about this is that if you need to get root access or want to use HuluBerry, you can use the dingleberry Firmware tool to just go back to 6149 and your root will still be there. Pretty awesome stuff in my opinion.
Big thanks to Chris Wade and the other Dingleberry developers and the BNXtreme team for making all this possible!
Also, if you want to update your Playbook further, I can confirm that sideloading all the bars from Playbook OS 220.127.116.1111 except the Android Player (which might still work, I haven't tried it) works just fine. You can download all those bars from the OpenSourceBB Playbook OS Page: http://opensourcebb.com/playbook-oses/
Co-founder and legal nay-sayer of OSBB. Owner of SCrApps Application Development, WebWorks aficionado, Open Source contributor. SCrid2000 on most blogs. I build awesome BlackBerry apps when I'm not doing legal work or spending time with my wife and two boys.
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Check out my apps in BlackBerry WorldWebsite: SCrApps.org