First search mo yung chipset. Then search ka kung paano mabuksan Engineer mode doon.
Sakin kasi MTK tapos nagdl lang ako sa Playstore Engineer mode MTK. Sayo naman is Snapdragon so search mo How to change band in snapdragon.
Another way para mapababa ang ping is to change DNS. Try using Cloudflare DNS.
Mas mababa yung ping nung Anti Malware at Family Protection kasi less ang gumagamit compared sa Default Cloudflare DNS.
Default
1.1.1.1
1.0.0.1
Anti Malware
1.1.1.2
1.0.0.2
Family Protection
1.1.1.3
1.0.0.3