Using the ‘Check for Updates’ feature under 6.48beta12 to upgrade to 7.0Beta8 results in the following message:
missing routeros-mmips-7.0beta8.npk
It should actually be trying to download:
routeros-7.0beta8-mmips.npk
That’s normal. I believe they did that on purpose so that the average home user would not accidentally upgrade to v7beta using Check for Updates. You have to upload it manually, and if you know how to do that, you probably know what you are getting yourself into by upgrading.
Exactly as explained above.