I can not blow up TNT with flint and steel nor redstone

When I want to blast TNT with flint and steel, its TNT is even to burn, if I blast TNT with redstone, no response what

Device: Redmi Note 4

OS Version: 6.0.1

CPU: Qualcomm 625

GPU: Adreno 506

ROM: MIUI Global Stable 8.2.10