Network problem after Oreo update on Asus Zenfone 3 max

Description: After update Android Oreo from Asus official website my network point always 3or 4 point plz solve this
App Name:
Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/201907/21/080356slysyv7pavymy9za.jpg
Rooted: No
Location: India
Frequency of Occurrence: After update Android Oreo 8.1 from Asus official website Oreo my network singal point low
Firmware/App Version: Oreo 8.1
RAM: 3GB
Model: ZC520TL
App Name:
Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/201907/21/080356slysyv7pavymy9za.jpg
Rooted: No
Location: India
Frequency of Occurrence: After update Android Oreo 8.1 from Asus official website Oreo my network singal point low
Firmware/App Version: Oreo 8.1
RAM: 3GB
Model: ZC520TL
0
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Comments
Good day
What's your phone’s firmware version (Settings > About > Software information > Build number)
Please check it in safe mode. (https://www.asus.com/support/faq/1005163)
Does this problem appear when you in other different location?
Please try to use other different sim card for a check if possible.
Thank you:)
Di HP zenfone 3 max zc520tl saya juga demikian, setelah update ke versi oreo malah sinyal lemah/tidak stabil. Saya juga lakukan menurut saran yang saya baca disini tapi belum kunjung sinyal bagus, tolong dibantu permasalahan saya ini. Terima kasih.
I buy this phone