@Volvo_seko Hi, please install the following firmware for your M7200(EU) V3: M7200(EU)_V3_220812 After that, please select WPA2 AES only to see if it will solve the problem.

@samktlim Hi, may I know who your SIM card carrier is? and when you test the same SIM card on your phone, the network stays on 4G or fall back to 3G or even 2G when you are on a call?

@Jumix Hi, thanks for the update, may I know the SIM card carrier of the first SIM card that didn't work with Chromecast?

@Henn9810 Hi, the system log doesn't include LTE disconnecting events, you mentioned that it works on 4G+ with band 3, please double check the network type and band when the problem happens, if the...

@ig_AlexPiLion Hi, May I know who your SIM card carrier is? and is there still 3G service available in your area? Please change the network type on M7350 to 3G only to see if there is 3G signal and...

@LArV Sorry, the MR200 doesn't support firmware recovery via other tools, may I know the current firmware version of your MR200?