Phomemo-PM-246S

1. Go to phomemo website. （https://phomemo.com/）

2. Click on "Support" -> "Download Center" -> Find "PM-246S".

3. Download "Diagnostic Tool For Windows" and "bin" file (for example "Q027-PM-246S-V221.bin")

4. Install "Diagnostic Tool For Windows". After installation connect your printer with your windows via USB cable. 

5. Click "Read" to check if the connection is successful. 

6. Click "Firmware Updates" -> "Select Firmware" ("bin" file (for example "Q027-PM-246S-V221.bin")) which download form phomemo website -> Click "Update"

7. Print a test page to check if the update is successful: Press feed button, after the blue light flash 1 time, release, printer will print a test page. Check software version.  (for example "Q027-PM-246S-V221.bin" software version is the last three numbers: V2.2.1)

3. Download "Diagnostic Tool For Mac" and "bin" file (for example "Q027-PM-246S-V221.bin")

4. Install "Diagnostic Tool For Mac". If cannot open, then go to "System Preferences" -> select "Security & Privacy". Under "General", click "Open Anyway" to set up.

5. After installation connect your printer with your mac via USB cable. 

1. Click "Read" to check if the connection is successful. 

6. Click "Firmware Updates" -> "Select Firmware" ("bin" file (for example "Q027-PM-246S-V221.bin")) which download form phomemo website -> Click "Update"

7. Print a test page to check if the update is successful: Press feed button, after the blue light flash 1 time, release, printer will print a test page. Check software version. (for example "Q027-PM-246S-V221.bin" software version is the last three numbers: V2.2.1)