I accidentally brick my Evolveo H4 box. I have installed CoreELEC on internal memory for years. Yes, I know, it is generally bad idea. I want to try newer CoreELEC and probably overwrite boot or u-boot. So currently my box is bricked

After power on, the led is flashing. I found serial pins on board, make it connectable and monitor what is happen. I try everything - make a bootable sd card from Knowledge and Tutorials but nothing helps. I try to search for firmware image, but the vendor didn't supply it. The box looks like any other generic Android S905X box. I make some photos so someone can tell if it is clone of some other better supported box. I use gxl_p212_2g.dtb which works good.
Please can anyone helps me? Is there any way I can save this box?
Serial output:
GXL:BL1:9ac50e:a1974b;FEAT:ADFC318C;POC:3;RCY:0;EMMC:0;READ:0;0.0;CHK:0; TE: 120108 BL2 Built : 13:48:56, Sep 23 2016. gxl g7459bd4 - jianxin.pan@droid06 set vcck to 1120 mv set vddee to 1000 mv Board ID = 2 CPU clk: 1200MHz DQS-corr enabled DDR scramble enabled DDR3 chl: Rank0+1 @ 912MHz - PASS Rank0: 1024MB(auto)-2T-13 Rank1: 1024MB(auto)-2T-13 DataBus test pass! AddrBus test pass! -s Load fip header from eMMC, src: 0x0000c200, des: 0x01400000, size: 0x00004000 New fip structure! Load bl30 from eMMC, src: 0x00010200, des: 0x01100000, size: 0x0000d600 Load bl31 from eMMC, src: 0x00020200, des: 0x10100000, size: 0x00015400 Load bl33 from eMMC, src: 0x00038200, des: 0x01000000, size: 0x000a9a00 NOTICE: BL3-1: v1.0(debug):fb68908 NOTICE: BL3-1: Built : 18:30:11, Nov 1 2016 aml log : bl31 normal boot ! [Image: gxl_v1.1.3154-065f772 2016-09-29 14:08:54 yan.wang@droid05] OPS=0x82 c 1 f9 5 9d 16 2c ad 19 14 17 91 [0.363001 Inits done] secure task start! high task start! low task start! INFO: BL3-1: Initializing runtime services WARNING: No OPTEE provided by BL2 boot loader ERROR: Error initializing runtime service opteed_fast INFO: BL3-1: Preparing for EL3 exit to normal world INFO: BL3-1: Next image address = 0x1000000 INFO: BL3-1: Next image spsr = 0x3c9 U-Boot 2015.01-g5272651-dirty (Feb 08 2017 - 09:49:27) DRAM: 2 GiB Relocation Offset is: 76ec9000 GXL:BL1:9ac50e:a1974b;FEAT:ADFC318C;POC:3;RCY:0;EMMC:0;READ:0;0.0;CHK:0; TE: 118790 BL2 Built : 13:48:56, Sep 23 2016. gxl g7459bd4 - jianxin.pan@droid06 set vcck to 1120 mv set vddee to 1000 mv Board ID = 2 CPU clk: 1200MHz DQS-corr enabled DDR scramble enabled DDR3 chl: Rank0+1 @ 912MHz - PASS Rank0: 1024MB(auto)-2T-13 Rank1: 1024MB(auto)-2T-13 DataBus test pass! AddrBus test pass! -s Load fip header from eMMC, src: 0x0000c200, des: 0x01400000, size: 0x00004000 New fip structure! Load bl30 from eMMC, src: 0x00010200, des: 0x01100000, size: 0x0000d600 Load bl31 from eMMC, src: 0x00020200, des: 0x10100000, size: 0x00015400 Load bl33 from eMMC, src: 0x00038200, des: 0x01000000, size: 0x000a9a00 NOTICE: BL3-1: v1.0(debug):fb68908 NOTICE: BL3-1: Built : 18:30:11, Nov 1 2016 aml log : bl31 normal boot ! [Image: gxl_v1.1.3154-065f772 2016-09-29 14:08:54 yan.wang@droid05] OPS=0x82 c 1 f9 5 9d 16 2c ad 19 14 17 91 [0.361495 Inits done] secure task start! high task start! low task start! INFO: BL3-1: Initializing runtime services WARNING: No OPTEE provided by BL2 boot loader ERROR: Error initializing runtime service opteed_fast INFO: BL3-1: Preparing for EL3 exit to normal world INFO: BL3-1: Next image address = 0x1000000 INFO: BL3-1: Next image spsr = 0x3c9 U-Boot 2015.01-g5272651-dirty (Feb 08 2017 - 09:49:27) DRAM: 2 GiB Relocation Offset is: 76ec9000 GXL:BL1:9ac50e:a1974b;FEAT:ADFC318C;POC:3;RCY:0;EMMC:0;READ:0;0.0;CHK:0;
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