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The playto/cast option is missing in my zenfone 3max .why is that?

Please help, thx

Community Legend II
Hi dejesus.marckjosef
Thank you for your asking. My device ZC520TL with firmware version TW-15.03.1810.194 has CAST. Kindly provide the information below so that we can better assist you.
1. Model Name: Settings>System>About phone
Refer to the link below to check the model name by model no. in the link
2. Your current firmware version
Settings>System>About Phone>Software information
If you try to update to the latest version, does the issue still persist?
3. Does the issue appear right after any system/apps' download or update?
4. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check on any disturbance from the installed 3rd party apps.
# How to enter and exit "Safe Mode"
5. Please try reset Network: Settings>System>Reset options>Reset Wi-Fi, mobile & Bluetooth
6. Also, please try "the Factory Reset" 
Settings>System>Reset options>Erase all data(factory reset)
Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.