Several kernel binaries in Colibri iMX6ULL

Hi team, just a quick question. I’ve been trying to flash several kernel images in the Colibri iMX6ULL: One as the one I’m testing (zImage) with several changes on it, and another one the original backup (zImageBackup) so I can quickly change between one and another from Uboot. However, I’ve tried several TEZI configurations and I’m unable to select the backup through setenv kernel_file zImageBackup, always zImage is loaded. I tried in TEZI 1.6 and 1.8. Maybe is currently unsupported/bug in TEZI, so I wanted to check with you.

Both configurations correctly flash the system and the system boots as intended, but I just can’t switch between both kernel files.

These are the configs I’ve tried:

"ubivolumes": [
                {
                    "content": {
                        "rawfiles": [
                            {
                                "filename": "zImage",
                                "size": 3
                            },
                            {
                                "filename": "zImageBackup",
                                "size": 5
                            }
                        ]
                    },
                    "name": "kernel",
                    "size_kib": 10000,
                    "type": "static"
                },
                {
                    "size_kib": 128,
                    "name": "dtb",
                    "content": {
                        "rawfiles": [
                            {
                                "filename": "imx6ull-colibri-wifi-eval-v3.dtb",
                                "product_ids": "0040"
                            },
...

And

"ubivolumes": [
                {
                    "content": {
                        "rawfile": {
                            "filename": "zImage",
                            "size": 3
                        }
                    },
                    "name": "kernel",
                    "size_kib": 8192,
                    "type": "static"
                },
                {
                    "content": {
                        "rawfile": {
                            "filename": "zImageBackup",
                            "size": 5
                        }
                    },
                    "name": "kernelBackup",
                    "size_kib": 8192,
                    "type": "static"
                },
                
                {
                    "size_kib": 128,
                    "name": "dtb",
                    "content": {
                        "rawfiles": [
                            {
                                "filename": "imx6ull-colibri-wifi-eval-v3.dtb",
                                "product_ids": "0040"
                            },
...

Thanks as always and best regards,
Alvaro.