How do I flash to a newer Android version when TWRP has trashed recovery image and boot? Hi to all Android Enthusiasts!

I have done something stupid :D 

Some website claimed that Cyanogenmod would not work unless twrp was installed. (ChristianTroy)

I had already rooted my device (Denver Tablet TAQ-80053 ARMv7 with Android 4.1.1) so I thought why not flash to TWRP with the file: "CWM-based-Recovery-v6.0.3.3-signed.zip"? 
BAD idea :( I admit, this is a bit confusing since CWM and TWRP are not the same thing AFAIK. Could be another file .....

Now "Recovery Mode" is only the "TeamWin Logo" then BLACK SCREEN and nothingness ??

Everything else is working somewhat normal: 
1) I can boot normally into the start screen of Android 4.1.1 and run applets etc.
2) I can connect to Windows 7 (x64) and get file access to everything.

But: Any flashing tool for windows (with ADB) cannot "see" my device, and I very much doubt it that the driver is the problem since I get full access to drives and files on the tablet (USB-connected to Windows 7 x64). Do you have any thoughts about that? To me it seems most logical that a working windows-driver would also work with ADB or am I wrong about that?

I also tried the ADB (Windows) installation with SDK etc. Everything installs fluently with no errors but when I do the "adb devices" command no devices are listed at all ?? The command "ADB Shell" returns an error.

Since I know about the settings needed on the tablet I have: set USB Debug Mode to ON and everytime I plug it in I select "Mass Storage Mode" to get file access from Windows; and it works fine.

As stated above, everything works except "boot into recovery mode" and ADB being able to "see" my device. Not even CWM Rom Manager can boot into recovery mode ??

I want to be able to flash a new OS but recovery mode seems to be the only way apart from the USB to Windows. I cannott accept the notion that the device is "almost bricked" just from installing the wrong recovery image and now I cannot go back ..... 
(backup got lost in the process).

I have discovered that I am not the only one with this problem but I cannot find any solution (that actually works) anywhere. 

Last "development" is this: I UN-rooted my device trying to get back OTA. I think that made things worse :\

Q: Is there a way to "wipe and re-install" without ADB or Recovery Mode /Fastboot ??

/Pete

Update #1: I have tested ADB and FastBoot (Windows prompt) with two other devices, both Samsung Smartphones, and everything works like a charm. This tells us that it is definitely the tablet that's got a problem or two ;)

Upd #2: I found a log file in the cache folder on the tablet called "last_log" and one line got my attention: "TW_NO_REBOOT_BOOTLOADER := true" Isn't that a bit odd ??

Upd #3: Seems like internal sd is write protected. cwm boot manager and tw(e)rp manager cannot update files needed. bootanimation app works fine with root. that is so weird :-\
First off, make sure you have the proper ADB drivers. Use the PDANet ADB Installer. It should install the right version of ADB.

Next, you're going to want to enable Developer Mode. To do this, open up your settings app. At the bottom of the screen (you may need to scroll), there should be a Developer Options button. Open that up.


  If you do not see Developer Options, go into your About Tablet and follow these steps:
  
  
  Find the "Build Number" value.
  Tap the "Build Number" five to ten times. You should eventually see a toast saying "You are now a Developer!" or something similar.
  Exit out and go to the Developer Options menu.
  


In Developer Options, find the toggle for "Android  Debugging." You want this to be on. It will ask you for confirmation. Go ahead and give it.

Now, go back to your computer and run adb devices. You should see the device there. Download whatever ROM you want to flash, and place it on your device's SD card. If you need Gapps, place it there as well.


  If you still don't see your device, make sure your USB storage mode is set to PTP. Go to Storage in your Settings app and tap the menu button. Select USB Computer Connection and set to PTP.


After this, you're going to want to run adb reboot bootloader. This will place you into Fastboot mode, so that you can flash a clean TWRP.

Once you have downloaded a clean TWRP and gotten into fastboot mode, run this command from the folder that the TWRP image is in (it may be helpful to move TWRP to the folder fastboot.exe is in):

fastboot flash recovery your_recovery_image_name.img


Give it a couple minutes, and your recovery should be installed. Reboot into TWRP using the Bootloader.


  If the bootloader has no such option, let the system boot into full Android and run adb reboot recovery.


When you're in TWRP, you're going to want to install your custom ROM. Consult the ROM creator for instuctions on how to do this.