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How to install IPK on MT7621 router

Problem: I cannot install ipk file on my MediaTek MT7621 router because it prompted "incompatible architecture" error.

The MT7621 CPU is MIPS architecture:
root@myRouter:~# cat /proc/cpuinfo
system type             : MediaTek MT7621 ver:1 eco:3
machine                 : YouHua WR1200JS
processor               : 0
cpu model               : MIPS 1004Kc V2.15
BogoMIPS                : 584.90
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 32
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa                     : mips1 mips2 mips32r1 mips32r2
ASEs implemented        : mips16 dsp mt
shadow register sets    : 1
kscratch registers      : 0
package                 : 0
core                    : 0
VPE                     : 0
VCED exceptions         : not available
VCEI exceptions         : not available

processor               : 1
cpu model               : MIPS 1004Kc V2.15
BogoMIPS             …

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