WRT1200AC v2 reallocate partition NAND

[Lovator]

Good afternoon, please tell me how to delete partitions mtd4 mtd5 kernel1 + rootfs1 (40 Mb), mtd6 mtd7 kernel2+rootfs2 (40 MB) and create mtd4 mtd5 kernel1+rootfs1 (80MB) I want to get rid of the alternative partition because I don't use it. i have usb to ttl cable and i can go into u-boot.

I found instructions, but they are not from my router and there is a different partition layout and I need to specify the correct blocks and partition sizes click

I will be very grateful if you help me with this task.

device nand0 , # parts = 10 #: name size offset mask_flags 0: uboot 0x000000200000 0x000000000000 1: u_env 0x000000040000 0x000000200000 2: s_env 0x000000040000 0x000000240000 3: devinfo 0x000000100000 0x000000900000 4: ubifs 0x000005000000 0x000000a00000 5: kernel 0x000002800000 0x000000a00000 6: rootfs 0x000002200000 0x000001000000 7: alt_kernel 0x000002800000 0x000003200000 8: alt_rootfs 0x000002200000 0x000003800000 9: syscfg 0x000002600000 0x000005a00000