Brake codes from Tech Stream

So my big screwup was evacuating the brake fluid reservoir during the engine swap. Silly me...I thought it would be nice to replace the reservoir fluid anyway. This all created a fairly spongy brake pedal but i still put several hundred miles on. Meanwhile, i got what is likely the Tech Stream knockoff from Amazon. Codes are now C1202, C1253, C1256, C1319 which all seem to relate to low brake fluid, low brake pressure, ABS, etc. I started bleeding using tech stream and when the front brakes were finished, the computer stopped talking to the car...possibly due to low 12v battery or dead computer battery. Then, I finished the rear brakes using the time tested method used before cars were smarter than me. Any predictions on whether this will work or whether the codes will vanish on their own? The pedal is quite a bit more firm.

 

I also have the red BRAKE letters which I'm thinking could be linked to ABS? Also, tire air pressure warning. The computer had the letters N/A next in place of the air pressure value which I'm guessing means dead sensor battery.

 

I used the Tech Stream procedure to bleed the brakes. While doing the left rear, the brake pump came on and dispensed a good deal of fluid thru the bleed tube as expected. This didn't happen on the passenger rear so I'm wondering whether that side is correct. Anyway, I cleared the codes and drove the car. Several of the ABS codes went away but not the 1202 code which could not even be cleared. Could this be a bad level sensor or connector and where is this connector? The pics show the codes before and after
bleeding. Also, prior to engine start, there's a buzzing sound under the hood that sounds like a quiet sump pump. Du nno whether this is normal for a Prius or has to do with the actuator. No barking though.