If you are obsessively searching because your speaker is failing, it may be time to consider a replacement. Technology moves on, and the Charge 3 is nearly a decade old (released in 2016).
Search for and download the JBL Portable App from the Apple App Store or Google Play Store. 3. Pair Your Speaker jbl charge 3 update firmware
As of 2020 onwards, The company shifted focus to newer speakers. You cannot open the JBL Portable app today and click an "Update" button for a Charge 3. If you are obsessively searching because your speaker