Thie IBM Support page lists the technology refresh levels and related technology refresh group PTF level for the latest IBM i releases.
Frequently Asked Questions (FAQs) about IBM i Technology Refreshes.
This IBM i Technology Updates web page has the latest information on IBM i Services.
Your source for the latest Db2 for IBM i Technology Updates, PTFs, and updates by category, such as security and performance.
Here you’ll find the latest information on all IBM i Technology Updates. IBM i operating system levels and related software products are frequently enhanced via PTFs. This site contains information, pointers to information, and articles that show how to use IBM i.