The official security update page for Nokia smartphones has been recently updated by HMD with details about the availability of August Security update. The page lists Build number and details like whether it is just a security patch or firmware update + security patch for a particular devices.
As per the updated information provided on the page, currently August Security update is available for all Nokia smartphones starting from Nokia 1 to Nokia 8 Sirocco. This include the latest Nokia 2.1, 3.1 and 5.1 too.
While Nokia 6.1 Plus is not listed yet in the list of devices we can confirm that it has also received the August Security update already. In case the security update is not yet available for your Nokia, you can check the build number of your smartphone and confirm it with the information provided on the page.
You can also click here for our detailed coverage of all software update news related to Nokia smartphones
