Always be extremely patient when reviving "bone dry" cigars. It usually takes months to avoid the wrapper splitting. The first month of restoration shouldn't exceed 62%RH, then gradually increase the RH by one to two percent increments in successive months. There will be flavor loss. It's unavoidable if the cigars have lost all moisture. This can be accomplished successsfully.
Several years ago a shipment of my favorite cigars arrived at La Casa Steve*R from a favored vendor. My wife neglected to mention the delivery, and set the shipping box in an area where I often put corrugated boxes that I use for shipping. It was right around Christmas, when many vendors are running specials, and I'd purchased enough cigars that I'd forgotten about this order. A couple of years passed before I discovered the unopened shipping carton. The uncelloed belicosos were dry, but undamaged. I gradually, over the course of a year, rehydrated them, until they had been restored. I'm quite certain they'd lost some of their power, but considering their remaining strength, I was pleased that they'd toned down.