So the new 'feature2' builds are still moving on apace for Windows 10 Mobile Fast ring Insider phones (keep up at the back!), though build 15207, now available for 'compatible devices', is just a small but important fix, making sure that crash and reboot cycles after a reset don't occur. By the way, you'll have seen my summarising thoughts on the to-ings and fro-ings over the last fortnight?

From the Windows blog:

Today we are excited to be releasing Windows 10 Mobile Insider Preview Build 15207 to Insiders in the Fast ring. This build is exactly the same as Build 15205 released last week but with one additional fix we would like extra coverage on from Insiders:

• We have added a privacy page to the Windows 10 Mobile OOBE and upgrade experiences that allows you to quickly and effectively make common privacy changes while setting up the device. However, Insiders have reported that their device would crash or reboot shortly after unlocking their device for the first time after the upgrade if their device did not have a password configured to unlock the device. After updating to Build 15207, you will see this privacy page one more time – but should no longer experience a crash or reboot.

Thanks to the Insiders who reported this issue and helping us fix issues quickly like this one!

So we're now beyond the build of the Creators Update and well into new territory - RS2+, anyone? Who knows, but at least critical fixes and improvements are being made to Windows 10 Mobile 'Fast' ring in parallel to the higher-numbered builds for PC. See my feature on upgrade paths for the various classes of existing W10M handsets and the wider grid covering older devices, even though most of these won't be able to take advantage of RS2+, even with the Insider programme.

Anyone with an existing phone that's officially deemed Windows 10 Mobile CU-compatible by Microsoft can join in the fun. In each case:

1. Upgrade to Windows 10 Mobile (if appropriate) using the Upgrade Advisor. After at least one update cycle you should then be on the Anniversary Update (a.k.a. Redstone). 
2. Head into Settings/Update & Security/Windows Insider Programme.
3. Join the Insiders programme and choose the 'Fast' level in the pick list.
4. Within a few hours your phone should be seeing the build mentioned above and you'll be running the Creators Update and beyond... 

Oh, and for those that are wondering, we're still waiting for the Release Preview ring to catch up to Redstone 2/Creators Update. My guess now is that Microsoft may skip the extra testing phase and just release the RP update at the same time as the first production devices tomorrow. Microsoft does love a Tuesday release!