You are not bricked, but you will need serial access. As bmork indicated you'll need to access the switch via serial port and then stop uboot and change the boot partition to image 2. Once that is done you can then boot back into stock firmware and upload the https://downloads.openwrt.org/snapshots/targets/realtek/generic/openwrt-realtek-generic-netgear_gs308t-v1-initramfs-kernel.bin image to partition 1. Boot again and use port 1 to access the switch for configuration. See Support for RTL838x based managed switches - #367 by slh for an example of how to access using a linux system. You would then need to sysupgrade to the https://downloads.openwrt.org/snapshots/targets/realtek/generic/openwrt-realtek-generic-netgear_gs308t-v1-squashfs-sysupgrade.bin image.
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