Download: Physics Textbook 2.0.9 APK

Compatible with Android

Developer: Techssesoft

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Android Certificate

Package:  com.techssesoft.physicstextbook

File MD5:  965621f61fe726ffb198494e4aa4bf9c

Certificate MD5:  d811aa1fc53370ebbbb5888e3801daf9

Certificate:  Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
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    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, ST=California, L=Mountain View, O=Google Inc., OU=Android, CN=Android
        Validity
            Not Before: Jun 28 10:18:16 2022 GMT
            Not After : Jun 28 10:18:16 2052 GMT
        Subject: C=US, ST=California, L=Mountain View, O=Google Inc., OU=Android, CN=Android
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (4096 bit)
                Modulus:
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                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: 
                CA:TRUE
    Signature Algorithm: sha256WithRSAEncryption
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📱 How to Turn Off Google Play Protect & Enable APK Installation

Important: Disabling Play Protect turns off automatic security scanning. Do this only temporarily and only if you trust the app source.

🍀 Method 1: Turn it off through the Google Play Store

Step 1: Open the Google Play Store app on your Android phone.
Step 2: Tap your profile picture or initial in the top right corner.
Step 3: Select “Play Protect” (it has a shield icon).
Step 4: Tap the gear icon ⚙️ in the top right corner (Settings).
Step 5: You'll see two switches:

Scan apps with Play Protect
Improve harmful app detection

Step 6: 👉 Turn both switches off (slide them to the left).
When asked for confirmation:
“Turn off Play Protect scanning?” → Tap Turn off.

🍀 Method 2: Turn it off from your phone’s Settings app (some phones)

Step 1: Open your phone’s Settings.
Step 2: Scroll down and select Google → then Security.
Step 3: Tap Google Play Protect.
Step 4: Turn off “Scan apps with Play Protect.”

Tip: To turn it back on later, go to Play Store → profile icon → Play Protect → ⚙️ and switch the options back ON.

🍀 Method 3: Allow installation of APK files (outside Google Play)

Step 1: Open your phone’s Settings.
Step 2: Tap Security (or Privacy & Security on newer Android versions).
Step 3: Tap Install unknown apps (or Install unknown sources).
Step 4: Choose the app you’ll use to open/download the APK (e.g., Chrome, Files).
Step 5: Switch on “Allow from this source.”
Step 6: You can now install APK files from that app.