When you have accidentally flashed the OMA Rocks ROM with the wrong kernel, the fix is relatively easy. The hardest part is to identify which kernel is specific to your tablet model. For 1st GEN models of the classic v88, TIG, v88S models (i.e. models that have "QUAD" in their S/N) it's best to use the default kernel the ROM is packed with (kernel bob#160).
For 2nd GEN models it's gets a bit harder because of all the hardware switches that Chuwi has done with their production runs.
Your best bet is to identify the kernel in your settings menu (Settings ----> About tablet ---> Kernel version. It should be listed there. Once you have identified it, Oma has provided DL links for all the current kernels here.
DL the kernel file specific to your tablet to your desktop. Now do the following:
1. Open up RKAndroidtool (v1.37) with Admin Privileges on your PC
2. Put your tablet into flash mode by first completely shutting it down and then holding down the Vol+ while connecting your tablet to your PC via a microUSB cable. Please note: do not plug into a hub and also do not plug it into a USB 3.0 port (only USB 2.0 or below)
3. The RKAndroidtool should recognize your tablet by saying "Found RKAndroid Loader Rock USB" see pick below
4. Unclick all boxes associated with the OMA Rocks ROM except the kernel box
5. Click the button on the far right of the kernel row (the one with the "..." in the box in kernel row. This is essentially telling the utility that you'd like to load a kernel file from a different location. Navigate to your desktop where you saved the correct kernel file and select it.
6. Now press "Flash ROM." Note: you should not press "Erase IDB," just "Flash ROM"
7. Reboot your tablet into CWM manually by holding down the Vol+ button and then the power button for 3 seconds
8. Now you should be able to flash the NAND_Fix file and "Bob's your Uncle."