How to restore the functionality of the TP-Link TL-WR703n router?

Question

TP Link

The device had OpenWRT firmware installed. I wanted to put dd-wrt on it, so to speak, "feel". Without hesitation, the dd-wrt (factory-to-ddwrt) firmware was downloaded, transferred to a flash card (which was mounted to the root of the system) and the installation was started with the mtd command. After rebooting the device, the system kernel does not load. I understand that I stepped, but is it possible to somehow revive the router now?
Download log:

AP121 (ar9330) U-boot
DRAM: 32 MB
led turning on for Is...
id read OxlOOOOOff
flash size 4194304, sector count = 64 Flash: 4 MB
Using default environment
In: serial
Out: serial
Err: serial
Net: ag7240_enet_initialize. ..
No valid address in Flash. Using fixed address
No valid address in Flash. Using fixed address
: cfgl 0x5 cfg2 0x7114
ethO: 00:03:7f:09:0b:ad
ag7240_phy_setup
ethO up
: cfgl Oxf cfg2 0x7214 ethl: 00:03:7f:09:Ob:ad athrs2 6_reg_init_lan ATHRS26:ATHRS resetting s26 s26 reset done ag7240_phy_setup ethl up ethO, ethl
Autobooting in 1 seconds ## Booting image at 9f020000 ...
Uncompressing Kernel Image ... OK
Starting kernel

And the download freezes. The power indicator lights up for a second and then goes out

Answer 1

wiki.openwrt.org/toh/tp-link/tl-wr703n Everything
is written there

Answer 2

Here is an article just on restoring the firmware on wr703n