https://www.instructables.com/id/Make-Blynk-Switch-IoT-4CH-Only-Use-Smartphone-ESP8/ A tool runs on Android platform to create an IoT project easy. Makes it easy to upload binary file (result of compiled Arduino IDE) to any Expressif ESP8266 development board via USB OTG or WiFi (OTA). Features: ★ Upload/Flash bianry file via USB OTG ★ Upload/Flash bianry file via WiFi (OTA) ★ Support any USB chip: CDC/ACM, FTDI, PL2303, CH34X and CP210X ★ Serial Monitor for debuging ★ Change the Blynk token, SSID & password automatically durring upload ★ No Ads (Pro version) ★ Access to Google Drive storage (Pro version) ★ Multiple upload widgets button (Pro version) Note: - Your device must support USB Host OTG, otherwise the program will not work - Use good quality OTG adapter/cable, otherwise the uploading failure - If you get error: "Failed download. Check network connection." You can try to download the required file manually from this link: https://github.com/bluino/ESP8266Loader and https://github.com/bluino/ESP8266Loader_extra then extract it to internal storage, so that you will have the /sdcard/ESP8266Loader folder. Warning: Try it on your own risk, it can damage your hardware (Android or ESP board) or lead to data loss (binary file or any Android data).