Review on 📡 Bluetooth UART Wireless Module: Dual Mode, SPP2.0 and BLE4.2 Support, Arduino Compatible with BQB and Rohs Certificates by Jake Atonyo

UPDATE: Downgraded from 3 stars to 2 stars due to lack of "ELET BLE” (for OTA update) Android app mentioned in the documentation. Not in the Play Store, not via an internet search. ORIGINAL: The module itself looks solid, but the documentation is not optimal. The device does not come with a label or sticker or anything to indicate where documents can be obtained. Web searches yield nothing. Finally, you can go to Revain QnA and find that there is a link to a Baidu network drive, but it has its own issues. 1) Although the document is in English, the website is not, so navigation is a problem. 2) You cannot download a PDF without creating a Baidu network drive account and uploading it through the app. No thank you. 3.) Although you can view the content of a PDF via the Baidu web interface, it often loads very slowly for me and certainly doesn't have the functionality of a full-fledged PDF reader app. Please fix this.