perfect baked jacket potato

(1)potato clean up and dry it then with oil and salt.
(2)put it into oven and using 120 degree with 40 minutes.

The proper way is 90 degree and waiting for 2 hours. too long...

I'm waiting now.. haha

Updated, failed. wait more half hour..

hoping it's the perfect baked jacket potato with the crispy skin and fluffy center...