Been there done that. Today was great...swapped an old 2 channel amp with a new one. I had 2 nightmares like that in the last few years...With a crestron DM switch where a simple power cycle turned into the darn thing not loading. After an hour of trying things with tech support i just started unplugging it and plugging it back up over and over till it finally booted. I probably pulled that plug 100 times. With Lutron we had a client with a party starting in an hour...window company shows up with a replacement lutron shade. House manager tells the window company to go ahead and replace the shade in the master bedroom...then shoots me a text to add the new shade. Lutron software was buggy as hell for a while and after 2 hours of failed uploads i made the window guy put the old shade back in. Shade was dirty so they ordered a new one and created a nightmare.