You downgraded to 1.5 and then installed eLoader? How did you manage to do that? Because the 1.50 firmware doesn't run on the PSP Slim.
What you should have done is use the latest Despertar Del Cementerio kit and install the 3.90 M33 custom firmware. If you want yo run the 1.50 kernel you will have to use the TimeMachine, although it's just a mixture of 1.50 kernel + 3.40 modules. That too, will be installed on your memory stick and not on the NAND of the PSP.
Oh, I forgot to mention that your PSP is semi-bricked and there may still be hope that you can recover your console.
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